T.L. I have a 4.5t powerlift. Its a clear floor 2 post though. I believe they do 4's as well. Only issue I have ever had is that they never put an "O" ring on the drain plug so it leaked. Easily fixed though.
I'm keen on getting one of those tufflits with the extra height as well for my new house (if I ever sell the current one.)
I'd buy one now for my existing garage but its not quite long enough.
Argh. I need more space!
Spookypt