So I came from the TP2 (after a brief stint with the 7pro) and am very happy. I've had a couple of minor complaints which are here:
http://forum.ppcgeeks.com/htc-evo-sh...preciated.html
But over all LOVE the phone. I too was worried about the processor speed, almost went with the epic for that reason, but I've been really happy with HTC in the past and wanted to stay with them. Haven't had any complaints about the speed, but I haven't really had anything to compare it to except for the TP2. Also, you can use your TP2 battery in the shift.
If you liked your TP2, I think you'll like this one too.