i used to have a umax... it had some nice software.
scan quality was ok....
but now that i have myu new canoscan N656U i've completely forgot about the umax. i only miss one piece of software which i still use with my cannon anyways, so i don't really miss it
but i like my cannon much better!
it looks nicer, its way smaller, takes less room, doesn't need a power plug... sounds better, seems to scan faster...
so in my opinion, i opt fo the 656u even though it doesnt seem you were considering it.