I read an article about the vertical mouse and subsequently purchased one. Although it says it works for the Mac, it's only half true. Not all the buttons are customizable as they probably are for Windows machines. The System Preferences doesn't really recognize that it's a vertical mouse.

It doesn't look like Apple has put one out (yet). Anyone have any good experiences with a vertical mouse on a Mac?

I'm not sure if i's relevant, but my Mac is really old. About 10 years.