Good question about the benefit of aero helmet vs. cost. Our shop did some real world testing of aero helmets. We found, regardless of brand or model, the aero helmet provided zero benefit in a 15 mile time trial. Aero wheels made a very big difference on the same course and it was determined that after one invests in wheels, then the other stuff like aero helmet, skin suit, etc. are next. Wheels should be first on the aero list for easily recognized gains.