I just want to add to what Gary already has said, I too fly AFPD and have found it to be a real help in improving my flying. AFPD does have an adjustable field of view allowing you to have a little more periferal vision, but I'm with Gary on this being the downside of simulators.

Gary,
I have the H9 Twist with an ST G51 and 12-4 fun fly prop, in the hands of our club 3D Guru it's awsome, in my hands, wellll lets I need a bit of practice
Regards to all,
Pete