In other posts on this forum, there has been mention of improved keyboard feel of the S900 over the PSR-3000.

In regards to the keyboard feel...there has been no documentation from Yamaha Japan making reference to a new action on the S900 and for all intents and purposes, it has the same keybed and keys as the 3k.

The new rich awesome SA voices on the S-900 (like the Concert Guitar) make one feel more connected to the keyboard so maybe people have this illusion.

All the best with the new instrument,

Ian