I've never flown piston heli's, but I have heard it's no fun compared to turbine. I guess I'm spoiled that way. I have heard horror stories about the TH-55's and manually using the throttle to maintain RPM. People failed out of flight school because of that commonly from what I hear. Now, I fly a heli with 2 turbines and 2 rotor heads, no autos though....safer that way.
Autos were difficult for me to get, and I'm not 100% on them, hence the reason I did over 100 in primary. Everything else is fine. For me, entry was easy, glide and airspeed was easy, decel was easy, but cushion just before tochdown......ever heard of spike knock in the 206?
I've heard it a few times!!