Even two years ago, it WAS a VERY big deal ... people used to say all the time that pros didn't use the Fantom X ... Although it's possible that the Fantom-S was responsible for much of that impression (even though they are REALLY that different except for the polyphony ... which IMO had to be upped not only to be competitive spec-wise with Korg and Yamaha, but also to handle the Fan-X's UltimatGrand uber piano patch ...