I bought an F55 this Spring and love it. I'm 6'4 and 240+ and ride a 63cm bike. The problem for me is that it is next to impossible to find LBSs with that size bike in stock to test ride a variety of bikes so I took a chance. Have ridden two metric centuries on it to date.

The F55 is aluminum/carbon with DA components and I find it stiff, responsive, and yet comfortable to ride. Seemed like a lot of bike for the buck and I have confirmed all the positive reviews I researched prior to buying. I even got personal service from the national sales manager when there were problems with 63cm frame inventory.