Got to shoot one of these today, and I gotta say... the POF is a well designed AR15. The lower has a ambi-bolt release just above the mag release which speeds up reloads and makes it alot smoother to work with.
The 6.8 SPC with a muzzle brake shoots pretty smooth as well. In fact, everything about the gun is smooth. The action has Teflon impregnated surface coating so the gun will run dry / dirty, with some Mobil 1 the gun was very slick... especially for it being brand new.
If you are considering a gas piston AR I'd take an honest look into a POF.