Once you get used to the mechanics and the various tunings it's not too bad. Like thehallway said, it is easier than guitar. It's kinda like the string version of trombone playing, everything is feel and space memory (a rather Yes like descriptions I would say). My Wife just said "when did Yes have a trombone player" ;~)
Ben Franklin discovered it, but it took Bob Moog to find it's proper use.