I really liked the form factor and features of this unit, and was excited to have my first truly wireless mouse for my recent 12" Powerbook purchase. Unfortunately, I found the response time lagging slightly and cursor tracking not as smooth or as fast as my Macally iOpti Jr. mouse, so (ultimately) it proved unsatisfactory. I also found problems with having to continually go back into the Bluetooth Pref in order to wake the mouse after the computer went to sleep and was re-activated, but did not pursue a fix since the performance was sub-par anyhow. I have returned this, and will try someone else's Bluetooth mouse until I find one the responds as well as a USB mouse (or give up entirely).