Mouse good, Amazon warehouse deals risky
592047
The mouse is great, but be careful ordering from amazon warehouse deals, mine said there was only damaging to the packaging however the mouse is obviously used, especially the braided cable is worn, cosmetic damage on the buttons, and actual pieces of the braided cable missing.  Everything functions of course, but for the discount it was not worth the damage especially since it was described as only being repackaged.
4370743
After a long process of reading reviews and comments across the internet, I discovered something about products on Amazon: they might be defective no matter how many replacements you order, because the shipment they distribute from is defective.

As many people have complained, the "middle clikc" functionality on this mouse is, to say the least, buggy. Now, it worked perfectly if you angled your finger's force to be perpendicular with the scroll wheel buttton! This is a problem, however, because the scroll wheel itself is slanted to the right relative to the surface you have the mouse on. So, if you push straight down on the button, the mouse thinks you are either doing nothing, or trying to push the scroll wheel to the right to scroll right instead of middle click.

I returned the mouse to Logitech, who paid for the return shipping and promised a new, fixed mouse, but the very next day (after my mouse was already in the mail), they told me they were out of stock for at least 2 weeks at the warehouse. Check, please.. and I won't be buying another piece of electronics from Amazon again.
2732926
I have no idea if this product is any good or not, actually. I sure wish I could tell you whether it's any good or not, but lo and behold I opened by eagerly anticipated package, and instead of finding a 3M Precise Optical Mousing Surface, I received an Iogear 800 dpi USB Optical Mini Mouse. Not sure how I'm supposed to use a mini-mouse as a mousing surface, but apparently someone in the warehouse thought it would suffice. The kicker? The mouse was labeled with information for the 3M Mousing Surface. So yeah, I'm pretty sure they're ALL labeled that way. I mean, why would only one be mislabeled? And why would a single mislabeled mouse be thrown in with the mousing surfaces? I'm pretty sure even the busy, rushed warehouse workers would notice an anomaly like that. So, buyer beware. This might be a great product, who knows? If you're like me, you'll never know.
2480987
I only bought this for the keyboard, which works great. The laser in the mouse is loose inside and causes the mouse not to function. I bought a refurbished one, so even without the mouse I thought it was a good deal.
1456804
Update:
After a rather fast response from the seller, where they arranged to send me two replacements (I only needed the one, but that was generous), I have a working mouse that I would easily compare to a Logitech. It tracks well on most surfaces, and the higher dpi settings are very accurate and smooth. The buttons are high quality micro switches, and have a nice resistant click.
Overall, I would recommend this mouse even though the original was faulty. I tested both of the new units they sent, and both work perfectly, and I had those replacements within two days of messaging the seller.

Get it. Its worth the price compared to bigger brands, and if something does go wrong, they will make it right. Its still a bargain, even with the extra inconvenience

Original:
Every time I left click, it changes the dpi! The dpi switch works properly, and the light blinks accordingly, but that light also blinks EVERY time I use the left mouse button. Do you know how frustrating it is to have your mouse change speeds whenever you click on something? Its infuriating, because its a decent mouse otherwise. It tracks well on almost any surface, the scroll wheel feels nice, and the buttons have good resistance
1201841
Logitech and Amazon; you can,t go wrong. Bought it used to save bucks. Lacked instructions but a web search of Logitech solved that.
2696710
Overall the mouse works well and feels pretty good in my hand however, the right mouse button is very sensitive and due to the shape of the mouse I keep accidentally right clicking, even when just resting my hand on the mouse. This could just be me. The software seems to work pretty good and it is fairly easy to navigate and create multiple profiles.  The quality of the mouse seems great and I love the texture of it in my hand. I feel they did not come with enough weights though in the package because I need to use all of them to get a nice feel.
Now if you get the mouse and have any issue or need to get a new one through the warranty it is quite cumbersome because the customer service is absolutely terrible. I had an issue where my mouse kept shutting off randomly and the only way I could contact customer support was through email. It is about a 50-50 whether or not they will reply at all and then when they do they will ask you for info and when you give it to them they may not respond again. I had to send a few emails just saying, "Helllo, did you get my last one." I eventually after 2 weeks just bought another mouse(not from them obviously) and this one works fantastic. Furthermore if you ever need to download the drivers and you don't know the website, you are screwed because they are not on any search engines. If you go to the actual manufacturer's site (challengerusa.com) they show the product but will not link you to their other site where you can actually download the suite. Just do a google search for Redragon mammoth driver download. or even redragon gaming mouse. No relevant information. (the disk that comes with the mouse a mini dvd and I could not put that in my type of dvd drive)

To conclude, decent mouse, horrible service, horrible website, and if you have any issues with the mouse you might as well throw it out and buy another because customer service probably will probably ignore you.
88808
After cramping too much with my old mouse I decided to purchase a new, larger mouse.  At $25 this mouse is a very good deal especially with its packaged charging station.  The rechargeable battery they give you unfortunately is pretty awful and after a few weeks it started causing my mouse pointer to jump around like crazy.  Just change the battery if this happens, it is not the mouse's fault.

The mouse is specifically for right-handed people and it is large enough so that you can actually rest your ring AND pinky finger on it as well (See that weird protrusion at the bottom right?).  I've been using this mouse for over a month now and my only complaint besides the faulty battery is the damn shiny thing on the bottom is peeling off.  Its a pretty annoying design flaw since my hand has little shiny slivers on it but once it all peels off its not that big of a deal.  I just hope Microsoft fixes this issue in their future mice.
476592
I unfortunately cannot rate this higher. I think people are onto something here where they talk about Razer making great products but the quality control is suspect. I think I have another case of that. This mouse in general is fantastic. Great response, and performance.

However I had to RMA my first one because the middle mouse button kept getting stuck. Level 1 support at Razer is a bit of a joke, telling me to reinstall their Synapse software or try different USB ports. It's like they could not understand there could be anything wrong mechanically with it. The issue went away and came back on and off for months, so I decided to RMA it and be abundantly clear this is a mechanical defect and bypass all the other "troubleshooting" steps they were going to lead me down.

I got a new one, and the middle click is fine so far, but now the right click is substantially louder than the left click. I think the manufacturing tolerances are not up to snuff or something. If something irrecoverable happens again, I probably won't bother RMAing another one. I think I am going to jump ship and try out Logitech's offerings.

--- Update 1 year later after already updated review.

I am indeed jumping ship to Logitech. Same issue again 1 year later after I received my RMA replacement. Middle click is sporadically failing to register clicks. Knocking down rating from 3 stars to 2. Such a shame, because like I said, when this mouse works its really very very good. But all clicks need to register, that is the number 1 important function of a mouse. I don't care what anyone else says about tracking sensors, etc. What good is tracking if you can't register the click?
4165608
I had two v450 mice in use on different systems, but after about 18 months the red one started misbehaving by registering a double-click about 2/3 of the times I left-clicked.  There's no service or support or FAQ on the Logitech web site addressing this, but there are many citations on various forums, none of which offered a satisfactory solution. Nothing, including resetting by removing batteries, running the Control Center software, or blowing out under the (non-removable) buttons worked. The mouse still works fine otherwise, and I suppose I could reassign buttons to meet my functional needs, but a mouse is about more than mere function.

So the red unit is going into the old mouse drawer, replaced by an M570 wireless trackball.  (I hope it holds up like the Microsoft wired tackball I've had since forever.) The black one? It's still running OK.
2474243
Good keyboard/mouse with one important warning: mine shipped with very old batteries that ended up leaking within a month or so.
1768135
On a multiple item order, item was received a week prior than all other items order shipped under the same property.  It is little oversensitive on the mouse movement.  I'm sure there is a sensitivity adjustment but haven't spent the time to look for it yet.
2396068
Picked up an iFeel mouse off e-bay out of curiousity. You can find them well priced on there.
This is my first optical mouse, and seems to be a decent one at that. The "iFeel" part is actually pretty cool, although I really do not see a reason for it. I can't think of any pro's or con's for having it. It works with a couple games (Black and White is neat with it) and it does let me be a little more accurate with clicking. Possibly a good tool for those with less than perfect sight?
It took some time to get it to work. Make sure you have the newest software if installing with XP.
Overall, if you need a new mouse, you can't beat this price for a great optical mouse. The motion part is just an added bonus--and it freaks people out who don't know what it is. A friend of mine searched the desk for 10 minutes seeking out the "roughness" under the mouse. Needless to say, the desk was clean ;-). Mouse was just set on "squeaky clean".
Pretty cool. Find one used or on e-bay. Try not to buy retail.
994260
the mouse is great. click is super soft sounding, much softer than that of the amazon basics wired optical mouse. Also, works great for gaming such as fps games.
3758155
I just upgraded to an off-lease HP 6800 with Windows 7, my first machine with this operating system.  The refurbished computer came with a Logitech keyboard and mouse, the latter a USB mouse with an adapter for the PS2 socket on the machine.  I began noticing all sorts of weird problems - Firefox would lose focus as soon as I clicked anything on a web page, Excel 2003 would extend the selection as soon as I clicked on a cell and would otherwise freeze, I couldn't move icons on the desktop, etc.  I assumed that these were Win7 issues, being aware that this is basically a cleaned-up version of Vista, well-known as a disaster.  I thought that using the PS2 adapter might be causing problems, so I ran the mouse from a USB port, but the problems persisted.  My next step was to acquire a native PS2 mouse; I selected this one because it is made by the maker of my computer, and is relatively inexpensive, although not the cheapest mouse on Amazon.

After shutting down, pulling the Logitech mouse off and installing this one, and rebooting, voila, all of my problems were solved.  I could use Firefox and Excel 2003 with no problems.  And beyond that, the mouse seems to have a hard-to-define feel of quality, a certain precision in movement and clicking.  For a small investment, I now have a computer which works well with my preferred software.  And the funniest part is that aside from the adapter at the end of the cord and the silver coloring on the HP mouse, my two mice look virtually identical, and both use the Microsoft mouse driver built-in to Win7.
2734821
It's comfortable and works well, but it's too easy to inadvertently hit the back button on the left of the mouse. It's annoying when surfing the web, but I imagine it could be downright disastrous for a gamer. I also wish the lowest DPI setting was slower and more sensitive for precision Photoshop work. That said, I think it performs pretty well for a bargain mouse.
3767970
I purchased a Logitech V470 Cordless Laser Mouse from newegg.com, the mouse died in about a week, and Logitech quickly replaced it. I'm a very satisfied Logitech customer. In the process, I discovered a quick work-around for a laser mouse that doesn't track. Details follow.

First the bad news:

About a week after I received the mouse, it stopped tracking. The right and left mouse buttons continued to function, but the mouse wouldn't move the cursor on the computer display. I couldn't return the mouse to newegg.com because I already had applied for a rebate. I looked for a toll-free telephone number for Logitech customer service, but couldn't find one. I found a toll number and had to pay for the service call myself.

Now the good news, and it's really good:

I called Logitech customer service, and they answered on about the second ring. A very friendly and knowledgeable service representative, who obviously was somewhere in the U.S.A and not offshore, patiently listened to my description of the problem. He asked me to try the obvious fixes, which I already had done. I'm not going to tell you the rest of the details because that might cause someone to abuse Logitech's customer service policies, but the bottom line is that I now have a new Logitech V470 Cordless Laser Mouse that works perfectly with my Apple Powerbook G4 running OSX. I haven't used the mouse enough to assess its longevity, but I'm a very satisfied Logitech customer.

Work-around for a laser mouse that doesn't track:

If you have a laser mouse that doesn't track, and you can't return it, try this, which I discovered in troubleshooting the defective mouse. Find a relatively hard, stiff, flat plastic sheet, large enough to be a mouse pad. The plastic should be similar to the blister-pack packaging used for small products like the mouse. The clear plastic cover of a report binder works great, and so would a flat sheet cut from the back of a large blister pack. Using fine sandpaper, rub the surface of one side of the plastic sheet until it's covered with tiny scratches but not uniformly dulled. Use the plastic sheet as a mouse pad with the scratched side up. Apparently, the plastic helps reflect the laser beam back into the mouse's sensor, and the scratches interrupt the reflections enough to tell the sensor that the mouse is moving.

I hope this helps!