I have a 7100t, works just fine. I think all the BlackBerries are slow
Basically my opinion on SureType, it's possible to use, but you have to force yourself to use it. Basically when I had a "normal" BlackBerry, I would always reply from it, but if I read a message on my 7100t and I'm close to my computer, I'd rather reply on my computer. According to the BES, I'm almost at 5000 Messages sent, so I've pushed it all I can with the SureType technology.