Pros: Perfect size, doesn't lose its tracking, on-the-fly DPI switching, conservative look
Cons: Side buttons are awkwardly positioned, build quality questionable
Fits my hand perfectly, standard grip. Slight protrusions on both the left and right hand side, ridges are for thumb/finger supports, I think. The clicks are quiet compared to the mice I have used in the past. There are three buttons down the center, along the same line of the scroll wheel, that are programmable DPI setting buttons. The on-the-fly DPI switching is handy. The included software for this mouse allows you to set the 3 DPI profiles, I tend to keep mine at 800, 1000, 1600 and just use 1000 for everyday use. There are lights on the three buttons, indicating which DPI profile is active at any given moment.
The left and right side buttons are unusually placed, or maybe I have small fingers, who knows? I have to position my hand in an awkward stance to reach these buttons so I tend not to use them for anything important. I have actually programmed the left side button to open the Windows Calculator since my keyboard doesn't have a Calculator button. The reason I mention questionable build quality as a con is that my left mouse button has been acting slightly strange. To hold down left click for some function, I have to be sure to apply more than adequate force otherwise it preemptively releases. Normal clicking is fine however.
For the price I paid for it, I can't complain too much. It's still much better than my previous $10 Logitech mouse. I'm a cheap person by nature and this wasn't a bad buy. I'm not sure if there's much better in the price range.
Also, the bottom of this mouse is red.