RC Screwz are stainless steel. I've been using them for a couple years in my offroad buggy. They are good quality. It's possible to strip them out, just like any screws, but they are not any worse than Xray factory screws.
I'm thinking about upgrading to a T3 from my T2'007. Is there any issues with the car besides the front arm holder problem? And has that problem started to go away, or are guys still breaking chassis?