Frequently criticized
Several owners say the weighted keys, while great for piano, are too heavy for quick organ runs, slides, and retriggers, with one comparing the lack of smooth key release unfavorably to a Kawai RH3 action.
Generally negative
Users point out the absence of a vibrato effect, no MIDI Thru, no channel aftertouch, and MIDI recording locked to 44.1kHz with no way to change it.
Generally negative
Multiple commenters note the YC88 (and CP88) are heavy at 40+ pounds, making them tiring to transport for gigs, prompting some to choose lighter YC73/61 versions instead.
Generally negative
Some users feel the acoustic piano sound gets thin in upper octaves or lacks the sympathetic string resonance found on other Yamaha instruments like the P-515.
Generally negative
A few commenters feel the Leslie speaker simulation and organ sounds fall short compared to Nord or dedicated organ modules like the Hammond SK Pro, especially at higher rotor speeds.
Generally negative
Some users note the YC only supports three layers, requiring an iPad and external synth apps to expand sound-shaping options.