I have had my pax for nearly two years. I had a problem with one of the speakers about 4 months ago and the sound was just wrong . The repairman messed around with it and it is fine. I dropped the keyboard once and broke the joystick ( its sa blooming heavy keyboard fellas) and had that repaired. Other than that i have had no mechanical/electrical problems. The OS system is very stable and obviously the keyboard is vastly improved since i purchased it thanks to Korgs very gracious OS update policy. In fact i still have not fully explored potentially 40% of the keyboards features because i have just been having such a good time playing the instrument and korg nicely keep supplying new features !

[This message has been edited by spalding4 (edited 06-08-2007).]