Took my 721 out for the first time today. I like it way much. The fit is pretty much perfect with the 58, the extra stiffness was noticeable right away, there's almost no toe overlap (as compared to my Affinity), and the steeper angles combined with the longer wheelbase make for pretty nice responsive and balanced handling. Needs a new wheelset so I can get rid of the clankity old junk wheels I pulled off my other bike, but other than that it's pretty awesome.