I have been sticking with my RF Receiver mice (Logitech VX Rev / VX Nano / G7), even though I have most branded Bluetooth mice available, including Apple Wireless Mighty Mouse, Razer Bluetooth Notebook Mouse, and the Logitech V450 bluetooth (I might have got the model number on this one here).
Anyways, after using the wireless mouse with just simple RF Receivers dedicated for that purpose, I never went back to BT Mouses, just because the tracking is usually shitty. The pairing is a pain in the ass (and no, you don't pair it only once, if you lose the connection the computer failed to pair on boot, you will have to pair it again). The latency with the bluetooth connection is unbearable (there is a definite, but minimal lag from mouse to pointer when compared to RF mouses). And no, I am not even judging bluetooth mouses to gaming standards here.
With good branded RF Mouses, connection is like wired mices, plug in the receiver and go. Lose a connection? Unplug receiver, plug receiver, continue productivity. Tracking is generally better than its bluetooth counterparts, and any mouse movement generally gives immediate feedback.
And ok, Bluetooth mouses look better overall and does not take up an USB port. But usability and ease of use suffers in turn.