Pros: This thing is huge! It really helps because you are able to set mouse settings to an extremely accurate level in games and not have your mouse bump into things.
Cons: Some may find it a little too big, nothing scissors can't fix. Then you have two.
Pros: Very nice size, definitely bigger than average and works well for my uses. (Competitive CS, ESEA Scrim Games, etc). No more worry about running out of mouse real esate...