I am waiting on an AX Endurance SL. Hopefully I won't miss the padding of the comfortline on 7 hour rides.
I went for the 8.0 BB drop, which lowers the BB, for better stability and descending. I designed the frame based on what I liked on about a dozen bikes over the years and I always loved lower BB's on switchback descents. My design preference would be to use about a half degree shallower head angle on most of the stock Calfees too. But that is because I like the steering a little slower than most American criterium kings (174cm tall and 60kg I don't have a chance in those anyway).
As I understand it, Serotta used to have 7.0 drop on his frames but went to 8.0 on all of them because all the custom requests kept asking for it. I think he also uses shallower head angles than the stock Calfees.
The complete geometry is
56.2 Top tube
54 Seat tube (center to below seat clamp) maybe should have gone 53.
12.0 head tube
73 degree head angle
16.1 setback(= 72.6 degree seat tube)
8.0 BB drop
Plus had an internal shim put in the bottom of the seat tube to stiffen the BB and counteract the extra lateral force from the pedal axle extenders.
I am very happy with the way it turned out and how it handles. I haven't really gone balls to the wall on any descents yet since I had a bone scan last spring and found out I was on my way to osteoporosis. After a year on medication I think I will feel safe enough to let it rip again. I didn't want to end up like Tyler Hamilton this year.