Hi ,
Yes I think the keyboard is a bit noisy but unless you are playing very low volume it should not be an issue. I almost didn't buy this Casio for that reason. However after playing the Korg Krome, MOXFX8 , and the Yamaha 266 ( ? ) I concluded that Casio offered the best package for me. I found the MOX to be very hard to play , the Krome with too thin keys and the Yamaha ... nicest keyboard feel BUT weighing in at over 50 lbs was not feasible for a gigging piano.
I ordered the PX5-S and the PX560 and tried them both this week. I'm keeping the PX560 cause I could play / and program it right out of the box ... great user interface & touch screen. MOXFX and PX5-S make you jump through way too many hoops to get to the reason you bought the piano in the first place" to play and create " :-))) Wish the Casio had as good of drum patches as the Yamaha but I guess you can't have everything.