I too have a Nexstar. I wont be using the AFS at all. When i read about the feature it seemed to be "the beginners answer to an instuctor". After using the sim provided with the Nexstar i dont know how anyone would want to fly with it "on"??? My first week flying with the sim i didnt have the AFS feature turned on, then i used it on the sim. Let me tell you it scared the crap out of me on the sim.
Now just imagine had i flown it for real. I havent established a good feel for all the controls and the AFS didnt feel right to me(a newbie beginner), so i can only imagine instuctors or experienced guys/gals who fly with the AFS must get really freaked out when using it. Dont get me wrong the Nexstar is a great plane, it just has maybe one too many "bells and whistles"(AFS).
Just my 2 cents.