We are in the process of buying a resale through TTS - I have had a very good experience with my agent, but not with the rest of the staff. It took them 3 tries to get the correct name of the property we are buying on the contract, and then the paperwork from the escrow company had the wrong resort name on it as well. I was "this close" to backing out entirely, but my agent went to great lengths to make sure we were comfortable with everything, and was very understanding of my frustration with the multiple errors. I think my experience is in the minority - most people on these boards seem to have nothing but great things to say about them.
I would recommend them - just make sure you go over all your paperwork to be sure it is all correct!