I bought this mouse for its compatibility with both Mac OS and Windows operating systems. This is therefore an excellent addition to my Macbook which is dual bootable and being bluetooth mouse requires no drivers or ugly USB dongles. Out of the packet it looks small, however it fits perfectly in the hand and I have had not problems using it day to day. It also comes with a rather nice neoprene slip case, which stops any damage when you through it in your laptop bag, and first set of AAA batteries. Only minor comment is that the mouse wheel feels a bit stiff and doesn't have a fluid feel, but all in all 5 stars for me.