QuasiUnaFantasia If you were the owner of a digital piano making company, completely intent on getting customers happy, what would you change (apart from lowering prices, and keeping supply always at the ready)?
On the customer side, I'm already ultra happy with my digital slabs (Yamaha P-515 and P-525). So that's a thumbs up for Yamaha. The only comments for 'improvement' are - when they go to the recording studio to get the samples of the CFX, they need to listen to each note (88 of them) for consistency in sound - eg. decay etc -- before doing the recording. That is - address all sound/note (decay profile etc) issues before running through with recording.
And also to get the alpha and beta testers to be more rigorous in the testing - for example the one-push recording glitch, which probably every yamaha digital and/or hybrid piano currently has -- the first note played/struck coming through speakers/headphones noticeably delayed (even though the recorded midi itself is fine).
Surprisingly - it is true that the P-525 headphone output (also confirmed by others) is very significantly lower in output power than for the P-515. So I can understand the issue that some are having out there with the headphone output power on the P-525. So once again - the alpha/beta testers dropped the ball on that one, and they need to stop that sort of thing in the future. Fortunately, I use the YL-WH500 wireless headphones with the P-525, which has no volume issue at all for either the P-525 or P-515.
Other than that. Just keep at it with regular evolution - eg. midi 2.0, more velocity samples, 24-bit sound, inductive sensors for addressing the wear-out issues inherently associated with rubber dome sensors etc.
For the music I love, and love to play on piano - my P-515 and P-525 are my piano paradise(s). I thank Yamaha for providing these two gems.