I have a PSAIII that I dearly love...but, it is the bow I'm most fearful of twisting the limb when stringing with my stringer. In fact, the only bow limb I've ever twisted was a MAII about 9 years ago. Cost me $75 to get it fixed. From what I've learned from some of you fellas I could probably have fixed it for nothing but I didn't know how back then.
I think the toughest bow I have is "The Stick" by Tim Strickland. Metal riser, head-to-toe camo, thick limbs and it really feels great and shoots super too.