Magic Mouse + a customizing app such as BetterTouchTool = bliss. For version 3 it would be great if Apple incorporated some of the settings like BetterTouchTool gives you (left or right clicking by tap, mapping for two and three-finger taps) into their control panel and supported additional gestures such as pinch / spread. And improve the sensor stack has others have mentioned. It's completely outdone by Microsoft mice of several years ago in terms of surface support and has actually been getting worse with age.
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