I have no problems with either the Yamaha Key Feel nor the Yamaha Key Size.

I can appreciate that the key feel could be a big stopper, especially for pianists.

However I find the key size debate much more amazing - its not that much different; in fact I only noticed once I started using a PSR630 as my "Top" keyboard and even then only because I lined up the left hand edges of my two keyboards and then noticed the difference at the other end.