Most of our team rides Cervelos. Only two of us have R3s and most of the other guys ride the Soloists. The R3 is stiffer and lighter but not as aero. We've determined the following - if you're all about the breakaway and have a tendency toward time-trialing then the Soloist is great. If you need a seriously, and I mean a seriously, stiff bottom bracket and a light machine, go with the R3. I should point out that I go about 163 lbs. at 5 8 1/2" The bike is SO comfortable it's ridiculous. And note that my "old" bike was an '03 Ghisallo. The R3 is much more comfortable than the Ghisallo ever was. I have a Powertap Pro laced to a 32 spoke DT Suisse wheel rear and a Ksyrium SSC up front and the weight on the bike is still under 17 lbs. I live in Western Pa where the roads are ****. I can ride for hours on the R3 and the bumps just don't matter. Either machine will do you wonders in the sprint. Any way you go, you're getting a phenomenal bike. Just look at what CSC has done in the Spring classics. Good luck in getting what you want.