I own a Volagi with some customization - replaced the Ultegra shifters with Campy and the Al handlebars with CF (only the DA model comes with CF bars. I think the online reviews provide more expert commentary, but I'm extremely pleased with the ride of the bike and the disk brakes on a long downhill are fabulous. I did also ride a Roubaix Pro and Expert, I believe, but not on the same roads so difficult to compare. Certainly the Roubaix was a nice ride.

I'm 200 lbs so the difference between my Giant OCR1 and the Volagi can't be more than 4-5 pounds, but what really surprised me is the difference in climbing out of the saddle. There is no question that when I'm standing on something steep (>12% for me) it takes considerably less energy to handle the bike at these low speeds. We've got a nasty 2400' climb right next to our house and the difference was discernible and with no fade on the really nasty descent. With the 11-32 on the Volagi I've got basically the same gearing as on the Giant triple, a necessity for us legitimate senior citizens.