Thanks for the answers so far. I can't test ride the bike since I live on Maui. I may go to the mainland to do it, but that really adds a lot to the cost of the bike. However, I ordered my Trek 5500 without doing a test ride and it was an expensive bike at the time ... it was fine. It fits fairly well (seat tube angle a bit large so I have to push my seat all the way back) and I'm learning how to compare most frame measurements, etc. What I was looking for was someone who has ridden both a Trek 5200/5500 and now owns a Cervelo. It seems Brandy has done just that with no problems. My main concern was the need for a higher head tube (between the Cervelo R3 and the RS). It seems the R3 with the smaller head tube would probably be fine for me since I'm riding a bike with my handlebars relatively lower than my seat and the Cervelo R3 has a 12 cm head tube and the Trek has a 10 cm head tube, so I will actually have a higher head tube on the Cervelo R3. The RS is supposed to have a more relaxed position with an even higher head tube, which I'm not sure I need, hence this message to you. I ride my bike for exercise several times a week, participate in centuries when I can, and I rode my Trek with a race oriented geometry across the USA this past spring without any problems. Anyone else have an opinion of which one would I would like best: the Cervelo R3 or RS? Thanks so much for your opinions.