I have long searched for a reasonable Bluetooth mouse that: - A comfortable weight, - A good size and - Has a good processing. This one fills all. For me it is running on a MacBook Pro Retina 15 "Mid 2012 (10.9.5) with no problems. It feels very high quality and has for my relatively large hands, the optimal size. Also, various substrates have no difficulty or dropouts. From me there is a strong buy recommendation :-)