Hi:
I did not have the Tyros1, but I did have the PSR 3000 a very close in features and tone generation, I did upgraded to the Tyros2, and NO regrets at all....You will find new features like audio recording, besides the beautiful sounding S.A., new Mega sounds, etc.....and of course, the 400 styles that includes, if you find some names that are the same on your T1, be prepared, Yamaha DID improvements besides the new tone generation, as a quick example, the Guitar Serenate, Intros 2-3 and the vartiations are diferent than in the previous model.....I like better the new ones, and things like that you will find a lot of fun feautures, I am aware that every player has diferent style of playing and therefore the needs are also diferent too. Still, you will find a very rich sources of sounds/styles/features that you can use.
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mdorantes