Cons I can say would be the price.
Also, its wireless is it not? I personally consider wireless mouses to already be a con because you have to get batteries so often and its a pain when you're in the middle of doing something important, and really doesn't have to be all that important, but say you're looking at porn and someone walks in and your mouse is dead... screwed now son!
Other than that it is typical Logitech, just plain expensive, I would search google products for cheaper prices.
Pros? Well, I'll say it again, it is made by Logitech, so I'm sure its made out of only the best and lasts a while.
Heck even check out that Logitech G15 keyboard which has a built in LCD screen so you can use LFS outsim.