Once you get used to the rather touchy method of scrolling, I found the new Apple mouse quite decent. Probably not worth the price tag as equally good or better wired mice are available much cheaper.
The nice thing about the Magic Mouse is that you can assign gestures to anything, whether a script, workflow, key commands, etc etc using a tool like MouseWizard. Obviously not any faster for us keyboarders, but perhaps useful to you. Note this mouse does not work in Windows, as far as I know.