They all load into the T2. I'm not sure if they sound better as I've not had the T1, but at the worse they will still be the same.
I use quite a few T1 voices that I have edited. You can easily re-voice them once they are loaded in and with the styles you can also swap the parts for better sounds. It's really easy and quick to do. There's loads of quality styles and sounds already available for the T2 anway that's on the net for free as well as ones you can buy. In fact there's too much to be honest, it takes me ages going through all the new styles and sounds I keep finding and editing
You certainly will not regret getting one and the T1 stuff you already have is all ready for loading into the T2.

[This message has been edited by Craig_UK (edited 07-11-2006).]