When I worked at Sam ASh for a summer, before I got booted for some unknown reason, I sold allot of the keyboard units. Someone actually stole the rack mount version right from rack in the store, so its in demand I would say.
the tape record function is pretty interesting, but the 4K is just on the next level though, and the filters are state of the art, at least for awhile.
The keyboard on it is what makes it like the Triton, which is a sweet piece...of crap...just kidding. I like Korg allot. The weighted keys are cool if your into keys, and the newer digital I/O interface is good. Damn , now I want to get one.