I've been playing both the Tyros and the PSR2100 in the store. From initial reactions I would say the 2100 is a poor man's Tyros. In other words, the 2100 is a LOT of keyboard for the money, compared to the Tyros...at about 1/3 the price. Yes, you lose the "megavoices" and some styles, but I don't think that's such a loss compared to all that's packed into the 2100. I tried playing the megavoices live and it's impossible, as far as i can tell.
In comparison to my VA7 and KN7000, some
of the 2100 voices shine. The strings excell. So do the woodwinds. The sop.sax is the best of any I've heard compared to Technics or Roland. The brass is OK...not better, just as good. And the drums blow the doors off the KN. and are more natural sounding than the VA's. Now as far as the deeper things such as the sequencer or the DSP, I cannot comment. I could not go that deep at the store. I spent hours there already. I'm afraid if I stay any longer, they might charge me rent! So there's my praise of the PSR2100 - a lot of bang for the buck. I am more tempted than ever to go out and get me one!

P.S. The styles on the 2100 are tasty, too.

Tim