Pros: Very convenient shape and button location and plenty of extra buttons

Cons: Doesn't track very well at all and needs a mouse pad to be useful and even then fails to track quite a bit too. VERY bad microswitches, classic Logitech bad microswitches.

Overall Review: Its an utter obscenity that Logitech keeps using these very bad microswitches. The previous Cordless MX Duo had exactly the same problem and they should have fixed it by now.