I've been running TouchPal for a couple weeks now, and am fairly pleased. It is fairly fluid, and does a good job with the predictive typing.
My only issue is that I find myself having to do a force close a couple times a day. Strangely, it seems to happen mostly when I'm in landscape mode. I also keep getting notifications to update my dictionaries, but every time I try, I receive an error, and again, need to do a force close. The only way to remove the update icon from my notification bar is to shut off, and restart the phone.
I'm running version 4.8, and when I do a check for updates through the settings, it tells me there is none. I think I'll go look for version 5, and do a manual install.