On a wheel the GT TT handling is good once you get it set up correctly and is a challenge to drive it fast, like you expect it to be for Pro physics. Using the controller takes a lot of skill, more than I have, and i expect more than any on here has, but that is the whole purpose of the TT, to find the great drivers.
Still this delay is a bit of a shame no problem for us as its not delayed over here, still for what its doing its way above any other racing sim games coming out, I would rather them spend time polishing and improving the game than rush it only to patch it all the time.