Hi TM,
I liked it a lot...very light touch, excellent velocity response (if you press a key easy enough, there is no sound...just like piano) but certainly may not work for those who prefer semi-weighted keys as per Tyros' superb FSX keybed or the higher end Korg's really nice Fatar made action.
Also, it doesn't have aftertouch, which may or may not matter. What type of arranger are you presently using?
It the same action found on the PSR-3000/S900/S710/S700 etc....my experience with it has been very positive, with no failures despite very hard usage. Gary Diamond has a PSR-3000 that has a lot of playing hours on it and it's still going strong.
Ian
As far as I know, the PSR-A2000 uses the same action as the S910, and if possible, try before you buy.
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.