The ever slightly smaller key width is barely noticeable to me (especially compared to the difference between weighted -synth action keys) when switching back and forth between the Tyros and the full sized heavy weighted action keys on my Steinway B Grand piano. Maybe it's because I've had to learn to quickly adjust to many differnent piano/keyboards over the years as a gigging musician, so Yamaha's imperceivably smaller keys are the least of my concerns. I find it very easy and really enjoy playing on PSR Yamaha keyboards, especially the Tyros. - Scott