GC in Boston had both the 88 and the 61. Acoustic and electric pianos sounded great. The organ, however, left a lot to be desired. Perhaps I've set my expectations way higher than I should have, I know.
Action was nice on both of them, from what I remember (I was down there a week and a half ago.). Same keybed on the 61 as the MODX6/7, I'm presuming. As a MODX7 owner, I don't mind the keybed. It would be interesting to A/B the 88 action to my RD-1000, as that is where I find the most comfort in terms of playability.