Oh, c'mon! You KNOW that light weight beats feel and response any day, here at SZ!

I haven't played the full 2 keyboard XK3c system yet, but I did get down on a Mini B by Hammond (the replica wooden one) and well as the Portable B3 Hammond replica. Very nice, but I didn't quite feel the same as you about the action. Maybe it's just that most real B's have been played in quite a bit, but both those actions felt a little stiffer, or springier (hard to describe) or something 'not quite right' compared to the B's I've played lately.

Just glad I don't have to hump one...