As they say, it ain't what you've got that matters, its what you do with it.

The Tyros 2 to my ears sounds fabulous. But then so do all the other top-end units.

When I look at a spec sheet I look at features and flexibility. I take sound quality as a given at this end of the market.

For comparison my aging Ensoniq SD1 has all of 1 megabtye (I think, maybe 2!) of ROM dedicated to piano waveforms and it still kicks thingy.