The only thing "sad" about the fact that they also make a left-handed version is that Windows can't handle 2 different mouse cursors independently - otherwise you WOULD have 12-axis and a bunch of buttons under both hands... That just might kick ass under Linux, though.
While the older 3DM-Pro was mistargeted, it probably wasn't a matter of "not useful" but "market too tiny" - it does kick ass in AutoCAD and Cinema 4D, where I've been lucky enough to see some people owning the older model use it with relish.
Also, I have a friend who's missing an arm, and that would be a boon for her. I think I'll get one for her too.