I ride a '15 AR3 which is basically the same only with Ultegra. I just happen to ride which was probably the most "meaningful" ride on that bike today with the brutal winds today (15-25mph gusts).
This thing rocks. Tube shapes make a lot of difference - I believe I'd feel the same way if I got a Venge, TMR01, Aeroad or whichever aero bike's out there.
I don't know how powerful you are as a rider but this is plenty stiff.
[MENTION=205580]250[/MENTION]0 for the AR5 it's unbeatable.