Official Steermouse website: http://plentycom.jp/en/steermouse/
Having used Apple's Magic Mouse for a month, I just found it to be highly uncomfortable and a hassle to use. Although it supports multi-finger gestures, the side-swiping forward and back motions did not feel natural and jarred the mouse from side to side. It made me long for my trusty Logitech Anywhere Mouse MX.
|The Logitech Anywhere Mouse MX paired with a Macbook Pro|
By default, the Logitech mouse works on OSX; however, the use of the shortcut button underneath the scroll wheel and the forward/back buttons on the side were disabled. Steermouse enables this functionality, and it allows you to customize the action of each button.
|Buttons 6, 7, and 8 allow other buttons, besides the fwd/back ones, to be customized.|
At only $20 US for a single computer license, it's a bargain considering the savings versus buying a trendy $70 Macbook accessory... the Magic Mouse.