I played on the CP88 for a couple of hours at GC... very nice experience. I hope the September update brings some decent organs & worthy "other" sounds for the the gigging musician ( strings, brass, etc... c'mon Yamaha, at this $$$ that's all that lacking here). That being said, the APs & EPs are stellar & definitely worth the hefty price tag, but for the moment it begs to be coupled with a second tier "meat & 'taters" board like the MODX or the FA-06.
The hammer action is great and easy to play, I felt like I was playing a grand piano - yes, the piano samples are that good. The EPs can be tame or bark like a rabid dog, it's all in your attack ( felt & sounded so realistic). This is an instrument that brings the best out of your playing, I didn't even realize that a few hours had passed until the sales guy started to hover over my shoulders.
Yeah, this'll probably be my new board, just needs better support sounds - heck, my RD-2000 is 10 lbs. beefier, doesn't play this good but it does have good "other" sounds and cost about the same. The RD-2000 is a great board & the action is the reason I got it but the CP88 is almost the replacement all in one board... your move Yamaha. :-)