I love the sounds on that Board. I have an S80, and the Motif continues Yamaha's excellently clean sounds. I like the Piano sounds... They are bright and not as mid rangey as your typical piano sounds. I especially love the Rhoades, EP sounds: Clear, crisp and very expressive. I was also happily surprised by the Synth sounds. Again very well put together. The Drum sounds are very good also. I am not much into orchestral sounds, so I can't comment on their quality.
I can tell you I played
the Motif 7, and the 8, and between the sounds and the board's action, I was very very impressed. The 7 was especially great in its action. Seemed very smooth and comfortable to play. As for the 88 keys version, I didn't spend enough time to get a feeling for the action, one way or the other.
As to the sequencer, I am not much into workstations, since I do all of my sequencing on my puter. If they ever come out with a rack version, I'm picking it up.
Try it out. I think you'll enjoy it.
Albert