https://www.keyboardforums.com/threads/casio-px-5s-vs-nord-stage-2-blind-piano-sound-test.25959/ This is a blindfold test between a $1000 Px5s and a $4000 Nord. The sound is great on both pianos. I've had my Px5s for about 5 years. The only time I hear key noise is when it's not hooked up to an amp.