I use a mouse with my 15" MBP - hand problems make a touch pad difficult for me. I have been using a Logitech USB mouse - perfectly satisfactory (except for the fact that it occupies a port. I recently acquired an 11" MB Air for travel. In view of the scant port situation, and wanting to avoid a "I forgot the mouse" situation, a bluetooth mouse seemed a logical choice. A little searching revealed a litany of complaints about difficulty in pairing, dropped connections etc. Nevertheless, I decided to try one. I bought a Logitech M535. It paired immediately and functioned perfectly. Out of curiosity, I tried it on my MBP. Again, pairing was quick and, while this is purely subjective, it seemed to be quicker and more accurate than the USB unit. Disclaimer: the only other active bluetooth device in the vicinity is my cell phone and that is paired only to my car. There is dual band wireless internet connection operating on the 2.4Ghz band.