This mouse is quite small, notably its quite short so might be a challenge for longer fingers/hands. Connecting to a Bluetooth-enabled PC seemed to require a few attempts before it paired successfully. Pairing with a Macbook was lot easier.
Over the months, it only refused to connect point blank to the Mac once. After a lot of retries/changing batteries/shouting etc it suddenly started pairing OK again. I have no idea what went wrong or how it fixed itself.
After 9 months of use, the left-click started to give up. The travel of the left button press got shorter and shorter, and it started to fail to register clicks sometimes. This became a royal PITA so I phoned Logitech support. Holy Cow! After giving some details and answering a few basic questions, a replacement was sent out totally free-of-charge. What great service :)