I have a 2014 AR4. I got it in mid November, and I love it. I am a newbie to road. I started mid year 2013. This is only my 2nd road bike, so no expert opinion. I chose it as the geometry is more aggressive than the Z series but less than the F series. The fact that it's an aero bike is just icing on the cake to me. I will take any help I can get. I don't race just recreation and benefit rides. I rode it on the 207 (Phoenix to Rocky Point Mex.) on Feb. 8th and 9th and felt fine. I have no complaints at all.