Cons: Developed a persistent glitch within one month of having it, namely that left clicks are often being registered as right clicks (or both at the same time). Problem started as very rare and over the course of a few days became annoyingly common.
Summary: Maybe I deserve these issues for buying such a cheap mouse. Maybe this is just to be expected. Here's the thing. I didn't purchase this mouse expecting it to break in six months. For any other unsuspecting shoppers, this is your warning.
Pros: Not costly. Feels decent in the hand. Looks okay.
Cons: Within six months this mouse began to fall apart internally. Here are some examples: Scrolling one direction unexpectedly scrolls the other direction for a tick or two. Occurs mostly when scrolling quickly. Clicking occasionally causes a double click, or rarely no click, to occur.
Summary: For the relatively (but not extremely) low price I paid for this mouse, it's not worth the time, money, or effort to request a replacement on the assumption that this one is faulty and not representative of its brethren, so I guess others may not have my bad experience. However, I'd be more likely to chalk such variance up to poor Q/A.
Cons: Horrible resolution; I'm not sure what is meant by 800 dpi, but from my results, it would seem to mean something like 70 dpi; the cursor is jumpy and imprecise on my not-phenomenally-high-res 1680x1050 display; selecting things with any accuracy is impossible, and I spend a long time trying to place the pointer as it jumps around. The optical sensor is equally garbage; as I move the mouse in a straight line, the pointer wobbles. I have turned the acceleration down all...
Pros: good look and feel, good price, quick delivery, because its 800 DPI it will scoot across a big screen when the mouse control panel is tweaked, wheel responds well, optical (so no mouse pad required)
Summary: Middle button did not work until mouse driver was installed from the website. Excellent mouse.
Pros: Very comfortable for long hours of gaming, tracks accurately and has responsive keys. Rugged feel of both mouse and cord, I expect this mouse to last a long time. Would purchase again.
Cons: Middle scrolling appears to react differently to separate applications, going from very sensitive in photoshop to moderate for web browsing. The good news is this can be adjusted in the Mouse Control Panel.