Top critical review
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Save your money and buy a good usb mouse.
on December 30, 2014
Bluetooth connection goes out a lot. Some forum traffic suggests that the problem is a small difference between the dimensions of the batter compartment and the AA cells that it uses so that the connection in the battery compartment becomes broken through normal use and so the bluetooth connection to the mac is lost. This explanation makes sense to me in that I found that a little "percussive maintenance"--banging it on the table--would re-establish the connection. Also putting little bits of aluminum foil against the negative connector in the battery compartment also seems to help.
Finding the location of the left and right "buttons" on the smooth surface can be a problem. Successive attempts bring up option menus and other things that get in the way of doing work. Also if you grip the sides too strongly you can send a back arrow to the browser (in my case 64-bit Chrome) and loose your work.
Supposedly using gestures to scroll up and down with the magic mouse is smoother that with a good usb mouse. I didn't find this to be true. You can also use gestures to scroll right and left, move forward and backward through web pagers, and to get to and from the dashboard. But the gestures are no more useful than the usual ways of doing this--clicking, keyboard shortcuts, etc.