The only reason I'm using the Logitech G600 both at home and work, are the 3 main buttons. Remapped the mid click to the right button, and it's a dream for work!
Not really using of the side buttons, but they are nice if you prefer extra shortcuts.
Logitech do have quality issues, so be aware of that.
G502 was good too, just didn't feel well for my hand.
I've also had vertical mice from Delux (cheaper brand than Evoluent), and was using one for a long time, even with some light gaming. They do need to fit your hand well to feel good.
Also tried MS Ergonomic round shaped mouse, but the Windows side button wasn't remappable, which made it useless.
Only thing I haven't tried are trackball mice. Maybe someday :D