Scott:
Outside of the lack of sufficient Ram memory, lack of provision for a Hard Drive, and the "pitiful/exasperating" Yamaha file saving system procedure (You can't save a registration in a floppy unless you have the style on Ram), the PSR200 hasn't had any malfunctions as of yet.
I have owned mine for over a year and experienced absolutely no problems with it.
I play on average a couple of gigs a week.
The only reason I am looking for another KB is that I need a better storage facility and a better file saving system.
As to any hardware problems I had no problems related to the buttons. I also try to "caress" the keys when I play and use the sensitivity feature built in on every sound. Based on all this, every thing being equal, I am going to wait for the advent of the Tyros and hope all the "quirks" of the 2000 will be eliminated. Maybe there is a Tyros in my future.
Mario