That last part is key. I've heard of at least one set blown and another set where a stud was snapped during install, but I'd likely write those off to installer error.
However, the same could be said for ARP. There just haven't been many sets of extreme studs sold yet, so obviously we haven't heard of many being problematic. Not that I'd expect to hear that anyway.
It's not like a stud is some black magic piece... the tensile strength is higher than standard ARP's for only a little more money, to me they are the best bang for the buck for studs for the 6.0 right now. The ARP 625's are probably great, but a LOT more money.