Update: AVOID this product! Died in just over one month of use
347899
Update: 3 Feb - The headset had died on me like the others who had reviewed. It now refuses to turn on. It shut down suddenly during one of my runs. Switched to different cables and chargers. Nothing worked. Now I really feel a lot of regret coz Jabra over facebook says I should just 'try' and see if the center in Singapore will 'allow' replacement. This is the kind of company we should avoid. Ones that refuse to stand behind their product in this globalise world. I'm going to head over and see if they will do the right thing or they will quote company policy. So much pain for a premium product.

+++
Ok. I've run a few runs in it. Now I can share my thoughts. Let's start with what I like Love the VO2 max test. Calls came through clear. The other party can hear me good. Love voice prompt. Love the app - well designed. Didn't fall off easily - that's good but it still did loosen and drop off when i start to sweat heavily. What I didn't like - I've switched to the smallest bud but it still hurt my ears somewhat especially after a half marathon run. The heart rate monitor is cool but for some reason it's HR reading can go off wildly at times. Like today - it registered HR of 180 when my garmin is only placing my HR at 120 and this is not just for one or 2 random readings. It actually lasted for 30 minutes despite several adjustments to headset. It would be better if the headet given the technology can also give run advice as I run instead of just informational voice readouts. It would be freaking awesome if the app is updated with such a feature eventually.
3905747
***UPDATE***
After unsuccessfully trying to go through D&B's lousy call centre (Denon's USA customer service). I am still without a working speaker and no option to replace or return this defective product.
**UPDATE**

I bought this on July 30, 2015 after reading all the great reviews. Speaker performed well for two months and now it is dead. Speaker is connected to wall charger but does not charge and does not turn on. Ofcourse, Amazon return policy has expired and now i am stuck with a dead $158 piece of junk. PLEASE DO NOT BUY.
4417067
After a month, it just stopped working... enough said!
690807
After 1 year of usage, this product is completely dead and no longer works.
2961598
For the price, the feature set is pretty unrivaled... It's all good... Up until it dies.

Output quality is really good, especially considering the tiny price... Build quality is another thing, though. After about a month, it started having reading errors, quiting playing and going back to the idle screen. A couple days later, it wouldn't even spin anymore, unable to read any disk. In the end, pretty much disposable...

Maybe our unit was defective, or got manhandled during shipping, but in the end, I'd have a tough time recommending this unit to anyone who needs to get more than a month's use out of it.
3513202
I bought this product on the 8th of Sept. To qualify my comments  - I am a Techie and have been building my PCs for a long long time .. so I do know what I am am talking about.

This drive failed within a month of very light use and as I was very busy, it took me another month to diagnose the problem.

I ran the Data Lifeguard Diagnostic utility from Western Digital that tell be that the drive has errors that it not able to fix. I even reformated the disk but it fails at different sectors.

Since I missed the window to return the product (Oct 11), I requested Amazon for the warranty information so I can return it to the manufacturer, over a week ago with no reply as yet.

Most of us store our very precious data on hard drives. I would not recommend this drive to anyone and more so it has shaken my confidence in all WD drives.
4915179
I bought this for my daughter on Dec 23 for Christmas (luckily it arrived on time) and it was great for the first month, but now it is completely dead and because it's after the holiday return window (of January 31, 2016) I can't return it. I expected so much more from a Sharper Image product, but it was a total waste of money!

I also bought my son a wireless speaker back in July 2015 (the InaRock 10w hi-fi portable wireless speaker), and it is still working great! I so regret not buying my daughter the same product, but I thought she would like the lights the sharper image product reflects on the wall (which she did love for the 5 weeks it lasted...).
3165565
I have been working with M-Audio Tech support to see if the driver incompatibility issues they have with my Mac Pro is what the problem is, but if not then basically the thing died on me two days after opening the box. Worked well up until then! I will update this review in order to help confirm tech support quality on this product as well as warranty return, and if the unit works well once they send me a new one, I'll forget the whole one-star thing. Until then, I just wanted to issue some caution---I've been reading about a lot of incompatibility issues with the Ultra 8R that might have sent me on a different course in purchasing.

UPDATED REVIEW 5/20/11.

Well, I bought this on 4/6/11, and it took a month and a half for tech support to give me the return packaging, fix the problem and send it back, I can safely say that it works perfectly now. One star for the way it was received, so only four stars now...took forever! Very helpful though on the M-Audio/Avid Forum. I guess everyone gets burned a little occasionally, don't let me dissuade you from buying this one, just accept my review as a word of caution!
1681247
I purchased these speakers based of the great reviews, and they seemed like a better quality product than the Kinivo brand that died after 7 months of use. I only used them with my laptop at times: they were treated with care, no abuse, etc. Always kept them in their storage bag when not in use.
In exactly 30 days, as my Amazon return policy expired, this product stopped working.
Very disappointed and frustrated.

Update: Amazon refunded the purchase price and offered free one-day shipping for a similar product.
3443734
Changing my review, as it just died, 11 months since purchase.
1490538
I bought two cameras of this model; after first month of use one camera started to disconnect from the network and the led going red; after removing power and turning back on connection came back, until it completely failed and went dead forever.

Update December 2016:
Second camera went dead as well. I'm downgrading rating to 1 star.
4394456
EDIT: I contacted Blitzu support and they were more than happy to offer a replacement free of cost. Did not expect a swift and friendly response. +3 stars for service.

It stopped working after 1 month's use. It started randomly changing modes and the power button was not effective. I let it drain, now it won't charge. Used it for commute.

(I ordered this through a friend's account on amazon.com, as it wasn't available on .in)
636093
Battery died after only 1 month and seller ignored my replacement request.
2039295
Stopped working after a month, don't throw your money away
788764
Updated:  Initially rated one star for the reasons stated below.  Have revised to provide a more neutral rating.  While product was defective, Amazon did provide a prompt refund without me having to jump through a lot of hoops.  After the initial disappointment that I couldn't spend likely the last nice fall day on my bike, the situation has been resolved reasonably considering batteries are sometimes defective.  Main concern was initially thinking there was no simple way to resolve this.

Battery was strong and fine at installation.  Tested as fully charged.  However, battery will now not hold a charge despite being on a battery tender.  Battery lasted only a month which is through the return period but it is now worthless.  Avoid this seller and this product if they will not make good on their product.
1138817
I bought this RUIZU X09 for listening to MP3 audiobooks & music while at the gym.

It lasted only one month. One day it just stopped taking a charge. The unit would light up when I connected it to the charger, showing a good charging connection, but it wouldn't take a charge. I left it charge for 24 hours and nothing. Tried different charges, tried charging it through my computer's USB port, nothing. As soon as I disconnected it from the charger and turned it on, the screen would light up, then flash a message "Low Power", and then flash "Bye bye" as it shut down.

During use it was a pretty good unit. There was one problem though: Anywhere from 1-5 times per workout it would skip. Sometime it would skip to the next track, other times it would skip ahead within the track. I was careful to make sure none of the buttons was getting inadvertently pushed.

They did a good job packing features into this tiny unit... and the screen is jam-packed with all kinds of information... at least in MP3 mode. The user interface is pretty user-friendly. You use the volume buttons to scroll through the different possible modes/screens -- Voice Recording, MP3 Player, Movie Viewer, eBook Reader -- and then use the selection/Menu button (M) to go into (select) the mode you want to use.

One thing you'll notice is the low-quality materials. It feels cheap and flimsy. You can sort of tell if you look closely at the power button on the pictures they provide on Amazon. But having said that, I will say that the unit held together just fine. Also, I wore it on the waistband of my shorts and it always stayed in place.

You can see this same review listed under the unit I purchased here (not sure why there are different listings for the same product):
http://www.amazon.com/gp/product/B00UG00NPG

One side note: I searched all over the place to find decent wired (not wireless) headphones that would stay in place while doing sprints on the treadmill (at speeds up to 11MPH) and finally found these cheap Panasonics. They're fantastic!

http://www.amazon.com/gp/product/B00E4LGVUO
4912639
This product was great... For four months. then it died. I couldn't believe the battery life, the plastic was a little chincy, but held up. They were comfortable, sounded pretty good, etc... But it only lasted four months before the left ear stopped playing sound, then another 45 seconds before the right followed suit.  They were still turning on, pairing, and everything else, just no sound. Even when the robo-asian-lady-voice normally said "B'yattery levell is hiiiigh". So now I'm sad. I hoped it was maybe a tiny bit of water, tried the rice-trick, no go.

Update: Egrd online tried very hard to make me happy, and through shipping issues, i never got a replacement. eventually I got a refund from Amazon/Egrd.  As I stated before, the product was very solid before I had an issue. Back to 4 stars