I am sick of Unstable Windows, I'll never go the Mac (one button mouse?? COME ON)... The A1 is the only viable alternative to me. Except maybe Linux on any platform. But family and friends wont accept linux, plus it's great for servers but still needs work for end users.
Oh please.. just plug in a 16-button mouse then. I use a logitech optical 3-button mouse in OS X and all the buttons work out of the box.
OS X is /the/ usable *nix on a desktop.
That said.. I'm still looking forward to OS 4 8-)