Yamaha action is pretty much the best action in regular line pianos. We are not trying to compare to Renner action those high end stuff. So u will not have that much problem with Yamaha action. Kawai using ABS action which is OK for the first 10-20 years, later then no one knows since this is really a new thing. But kawai tend to get lose on the key pretty fast, so be ware of it.