Pros: Nice design. Good quality. Fit my hands well.

Cons: Not power efficient like other Logitech mice (I compare it with my other Logitech wireless mouse which is also not a laser mouse). However, it does provide an on/off switch in which I've never used it.

Overall Review: I would recommend this product based on my experience using it.

Pros: Fast

Cons: Beware!! it suddenly fails without any signs of warnings. Lost all my important data. A lemon drive.

Pros: Cheap.

Cons: Some discs just didn't work eventhough they the verification. I've found bad discs from around 3 out of 10.

Overall Review: I've been using this for awhile. Never found any problems until recently. The quality seems to be dropped a little bit.