The DGX 630 has the GHS action...there is an 88 graded non-weighted action in the DGX 530, and 76 graded non-weighted in the DGX 230.

The weighted GHS is used in some CLP Clavinova, and also some of the CVP...it's pretty darn good, and very reliable and quiet.

The latest action is GH3 which has three sensors as opposed to two, which gives an incredibly wicked repetition rate, although the GHS is perfectly fine for my style of play.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.