I tried one before(ATI top folder), and just from firing, nothing prolonged here, there is part of the "hinge" that the second knuckle on my thumb is resting one that gets beat to hell after "pumpin a few good loads" through it.
I wouldn't piss on ATI if it was on fire. Thats just me. Its uncomfortable period. Its also made for little girl hands. If it works for you, then all the hell to ya. This is just my experience with it. Piss.
The factory Remington top folders were more comfortable for the hands, but if you are using a cheek weld and doing ALOT of shooting, you may feel it in the face over the course of a day. If you can find one of those, take it over the ATI if you have your heart set on a top folder.
Play around with a couple different stocks, or friends different stocks to see what suits you best, what fits you, and go from there.