With all the counterfeit detection products out there this is ...
920923
With all the counterfeit detection products out there this is the last one you want to buy.  My pens case in damaged and warped.  The UV light burned out with in a day and one of the markers were completely dry.. Just be weary of this product
167784
I bought this thinking it was an Original Canon product as you can't find them in-stores anymore.

Now, I HAVE the original 40D battery grip from when it was first released years ago and as soon as I torn away the package coverings, I immediately noticed that this is an imitation. They used 'Canon' designs on the box with all the right dimensions and colours. BUT, the picture of the battery grip on the box is not aligned properly and is slightly slanted. Inside the box, while there is a multi-language user manual, it is, however, missing cardboard inserts to hold the battery grip in place.

When compared to a genuine BG-E2N Canon Battery Grip, it has all the right Canon logos (genuine one uses brushed aluminium for the wordings while this fake one uses silver plastic) and product number in place but it is missing the serial number at the underside of the grip. Moreover, you can still see glue residue on the Canon logo and on one corner of the grip, the glue residue had immortalised someone's fingerprint on it. The big round knob that you turn to tighten onto your camera is VERY plastic-ly unlike the genuine BG-E2N, it rattles louder too and does not sit flushed on the bottom of the camera. There are also inconsistencies in the firmness of the buttons; AE lock button does not sink in as far as the AF point selection button; The shutter button does NOT have a noticeable focus click before taking the shot. The different parts that make up this item does not line up perfectly with each other either.

That said however, this product is a very convincing fake and I probably wouldn't have noticed it being a imitation if not for the fact that I have a real one to compare it with. Don't get me wrong, this battery grip WORKS. It's just that I'd never pay for $200 for a fake.
2558504
I was also victim to a counterfeit pair. Seems this is very common on this page. The original headphones are excellent for the price. I bought my first skull candy pair from a large retailer (BB). I forgot them in my pants recently before doing laundry and to my amazement they survived both the washer and dryer cycles. The only issue was with the mic, seemed no one could hear me clearly. Came here to buy another set and they were clearly counterfeit as soon as I opened the package (sound, build quality, etc). My poor rating is mainly for the high number of counterfeits here on Amazon. There needs to be better policing of this. I recommend buying these from a local store as you will guarantee they are authentic
3961167
I sectioned off my review into two sections. First being my testimonial; why I personally need this product. Second is my actual review. If you don't care for why I personally needed this please skip ahead to my review.

MY TESTIMONIAL:
As a recent victim of credit card identity theft I was happy to review these sleeves. When I first found out my credit card information had be stolen I had to understand what had happened. Was this an online based scam (I don't use my card online) or did someone local steal my credit card information? In my case someone local had stolen my credit card information and used it to make a counterfeit version of my card. They attempted to use the counterfeit version of my card at a grocery store only 20 minutes from where I live.

How they stole my credit card information is something I will never know. This is a card that rarely gets used. Its not used out of my eyesight. I didn't use it at a restaurant where someone could walk off with it and copy my information. After talking to my bank the only thing I can figure is that someone used an RFID scanner to scan my card while it was in my purse.

These RFID Blocking Credit Card Sleeves by Sefcard give me the piece of my mind I was looking for after this happened. Im still leery of how I use my credit card. I do feel better though knowing they are actually safe in my purse.

MY REVIEW:
I tested these RFID Blocking Credit Card Sleeves in three wallets. One man's leather wallet, a woman's clutch style wallet, and a metal case wallet. They fit all three styles. (Photos attached)

The only thing Ive found about these RFID Blocking Credit Card Sleeves by Sefcard is sometimes the corners are over glued. You have to push your finger into the corner to allow the card to fit. (Photo attached)

I honestly recommend these RFID Blocking Credit Card Sleeves by Sefcard to anyone who is looking for piece of mind and security. Its a hassle dealing with banks. Its unsettling knowing no mater how hard you proactively protect yourselves the thieves are just going to keep getting smarter. This is one small, inexpensive, way we can fight back.

I received this product complimentary from Sefcard for quality testing purposes; all opinions expressed are my own.
1635821
This product is counterfeit, the usb driver won't recognize it, i tried the newest drivers and the old versions too but no success. I am on window7, unfortunately, I bought this before the 2-star reviews appeared. am screwed........... Bottom line is, find another product, just not this one

UPDATE
Eventually got it to work, this page helped me a lot;
https://groups.google.com/forum/#!topic/deltabot/K_mra8p1xBI
4026004
I love the GENUINE product, it makes my hair shiny and smooth. However, some of the products sold on Amazon appear to be fake.
The last one I ordered from "Global Beauty Supply" certainly wasn't genuine in my opinion. It irritated my scalp
and skin. It didn't smell or feel anything like the real product, and it didn't do anything for my hair. In fact, it made it worse.

I had to write this, because I don't even know what is in it, whether it is safe or not! Very upsetting.
I contacted the seller, and they told me how much they care about their customers, and that it was a genuine product and could prove its authenticity. I accepted their offer of proving the authenticity and that was the last I ever heard from them. They refused to refund me as well. It doesn't make me feel they care about their customers. They'll receive no repeat business from me! So be careful!
2530203
After I compared the one I received with the battery that came with my 5D Mk II, I saw all the signs that people have warned about counterfeit batteries: No serial numbers stamped on the label or in the little box on the left side, The fonts are all noticably different, the blue part of the back label has choppy looking corners instead of perfectly rounded corners, the black plastic isn't as shiny where the original battery is shiny, and it doesn't slide in and out of the camera as easily as the factory battery.

It took a charge and registered in the camera, but now I'm wondering if the thing will last very long or explode in my expensive camera. Even the packaging looked like it was from Canon, so the counterfeiters have this battery faked very well by now. Beware of seller "columbususa" since they were the supplier on my order.

I recently bought a 77mm lens cap here on Amazon that was supposed to be genuine Canon brand too, and it is also a knock-off. I'm really getting pissed now because I specifically sought out genuine Canon products and paid their premium prices.

Update: This morning I looked at the packaging the battery came in, and at first glance it looks like a genuine Canon box complete with instructions, but the Canon Website indicates that all genuine Canon retail products come with a hologram on the packaging that changes color when viewed at different angles. This counterfeit box contains no hologram at all, and the cardboard and printing is kind of dull compared to the high quality boxes and ink used on genuine Canon products.

Also, the yellow plastic cover that snaps on the bottom of the battery is not as stiff as the original, the color is different, and again, the fonts on it are slightly different than my original. All indications point to this being a clever fake.

Canon's own Website acknowledges that there are counterfeits being sold as genuine, so take caution when buying these. I really want to return this battery, but I don't want to pay shipping again and pay restocking fees or whatever other bureaucracy they use to get more of our money.
1052340
I bought one of these "EasyN" IR IP PTZ security cameras, but got a generic no-name Chinese knock-off in a plain white box. (No product branding). The entire thing, other than the casing (which is mass produced by the thousands in China) is made of plastic, even the motors and drive gears. It won't tilt upward past 75-80 degrees, which means if you decide to use it, you'll have to mount it on a pole 25 feet high to be able to see anything higher than your knees.

All genuine EasyN OUTDOOR SECURITY CAMERAS are 12 VOLT-1 AMP. Not the .5 (1/2) Volt 2 amp power supply. Look closely at the product photos and you'll see the .5V on the power connection. (Unless the seller removes that particular photo after reading this).

I have bought and returned 5 Security cameras that were advertised and being sold as Name brand security cameras, but received product substitution or counterfeit cameras. I have done tons of research recently and am astounded that so many sellers are deceiving the buying public.
4331951
All these 5 Star reviews must be bogus.

The product comes with no manual, no CD rom, just a piece of paper to check some shortened URLs that will actually redirect you to a dropbox download file.

The iPhone app is awful, and it is also provided by a person, not a company.

As of 6/25/2014, their US domain is expired, apparently the company gave up due to all counterfeits out there.

BUY YOURSELF ANOTHER CAMERA, as most of the products for this brand have been falsified.

There are other customers out there having issues, avoid yourself the headache. Check reviews on these:
<a data-hook="product-link-linked" class="a-link-normal" href="/NEO-COOLCAM-HD-720P-P2P-Wireless-Pan-Tilt-IP-Camera-with-IR-Night-Vision-Support-iPhone-iPad-Android-Phone-View/dp/B00KZGMMPA/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">NEO COOLCAM HD 720P P2P Wireless Pan Tilt IP Camera with IR Night Vision Support iPhone iPad Android Phone View</a>
Specially this, with a comment which contains what seems to be an official reply from Neo Coolcam to a customer:
<a data-hook="product-link-linked" class="a-link-normal" href="/NEO-Coolcam-P2P-Wireless-IP-Cloud-Camera-PTZ-HD-720P-Outdoor-Waterproof-H-264-IR-Cut-Night-Vision-Motion-Detection/dp/B00HN32BQ8/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">NEO Coolcam P2P Wireless IP Cloud Camera PTZ HD 720P Outdoor Waterproof H.264 IR-Cut Night Vision Motion Detection</a>
3874952
Counterfeit, do not buy. I know it's counterfeit because 1) It's too cheap, 2) If you peel back the lable, it's shiny/metalic underneath, instead of flat grey like the top, and 3) The NFC antenna didn't work. It took me a while to figure out that it was the battery, not the NFC terminals I was using, but as soon as I switched back to my old battery, the NFC worked fine. I reported this to Amazon, so hopefully they will pull this seller/product off their site soon.
2743448
One of my clerk received counterfeit money, so I bought the Fraud fighter . It works wonders, Now all my clerks worry free.
Bring the money, we check it for free !!!!!
4354452
This one start review does not reflect my opinions on a genuine OtterBox Defender case - this review represents being sold a forgery.

One thing to note:  I am a big fan of the OtterBox cases and have had a defender case on every phone I've had since they first came out.  A genuine OtterBox case is very high quality and ranks a 5 star review from me for everyone one I've owned.

I know there is a growing problem with knock off products being sold so I tried to lessen my chances of getting a forgery by only purchasing an OtterBox on amazon.com if the seller was listed as Amazon.com LLC.

In this instance this was not enough, as soon as I opened the package it was obvious that this was a fake.  The quality was poor and everything in the case had a layer of dust coated onto the surface.  The quality and packaging were the biggest red flags - although the outside box had the hologram sticker and said OtterBox a quick search online showed the details that proved it was a fake.  The front of the boxes were different subtly in the placement of text and pictures.  Another big red flag was the belt clip that was supposed to be included was missing.

If you're thinking about getting an OtterBox Defender case I can't recommend one strongly enough - they are the only case I will use from now on.  Just be careful to make sure you will be getting the genuine product.  Just because the seller is listed as Amazon.com LLC be sure to double check the item when it arrives.  I will be ordering my OtterBox cases directly from the manufacturing company.
4395120
counterfeit shirts. The graphics clearly show that this was a picture generated on a computer and zoomed in to much giving it that distorted block look. No smooth lines like an actual element shirt would have. Also in the picture this seller puts up advertising the shirt is the real deal you can see the element logo on the collar. That is not what you will get. What you get is a shirt (a cheap thin shirt) that doesn't have the element logo. you can smell the ink its very pungent and the grey color is not nearly as dark as the picture shown
3191031
This is a counterfeit item, it is NOT an authentic Samsung product. The manual is full of typos and broken English, the software CD is warped and has a cheap stick-on label that was printed on an inkjet printer, the interface of the DVR is very cheap looking and also has tons of typos and broken English, even the box isn't a real Samsung box...it's just a plain brown box with "samsung all in one home security unit" printed on the side. It came with 4 AAA batteries for the remote even though it only needs 2 (two were a generic brand and 2 were Panasonic batteries that were just rolling around in the box). You can tell by looking at the text on the equipment that it's a cheap knock-off from China. This model number doesn't even show up on the Samsung website. I don't know if they're all like this or maybe it's because of the particular seller mine came from (it was only $288 when I purchased mine). I would not risk buying this.
3817185
I received a counterfeit product. Logo is not that of "real" spyderco knives. Edge retention is low and sweat rust  occurred quicker than I would expect with 440C. Was not expecting a "Made in Taiwan" etch either. I want to love this knife, but I feel like a got a bad deal.

However, I do think this is a great EDC knife. Well balanced, good handle/grip, simple look. It's still my "go-to" carry blade but I wish I felt like it was a real product. I could be wrong but comparing it to friends' other Spydercos I don't think this matches up.

Buy this knife, but not from amazon.
2208246
This product, although looks like a Rainbow Loom, is really a counterfeit product and VERY poor quality.  Rainbow loom replacement parts DO NOT work on this product.  Copy and paste this link to see more information on this.  Don't get tricked like we did!!
[...]
1120175
This is definitely a counterfeit product and doesn't screw in easily to the Hakko 936 soldiering station. However, since this is almost a 1:1 copy, you can move the plastic collar and metal sleeve to a genuine 908 iron which will allow you to use the smaller and readily available T18 tips. I'm happy with with that, but I won't give more than three stars for a counterfeit.