I rode a Trek 2300 carbon/aluminum road bike w/ aggressive geometry for 12 years before I sold it and bought a Trek Pilot 5.2 two weeks ago. I'm turning 42 this month and found the aggressive geometry to be too uncomfortable now. I had added a high rise stem to my 2300 to try to get into a more comfortable position, but realized it made more sense to buy a new bike that was designed for a more upright position. So far, I'm amazed at how much of a difference it makes. Bottom line is unless you are a hard core racer (and young!), the additional comfort the Pilot or Roubaix gives you far outweighs the small loss of aerodynamics. Both the Pilot and Roubaix are still very light, nimble, and fast. The best benefit is that the added comfort allow you to ride LONGER.