Mopar is the only one that I know of that broke a bolt. You don't know if it was over torqued at one time or not. I wouldn't condemn the pulley just because it is more complicated. Even the simple design of the factory MB pulley had issues in the beginning with the rubber isolator decaying and falling out. Mercedes has millions of dollars to spend on R&D and they still make mistakes. LET is real small in comparison but at least they stand behind everything they sell, a lot better service from LET then my local Chrysler dealer who told me they can't replace my inner door panel which is damaged from the factory because they aren't SRT qualified, WTF it's a door panel.
Several people have come up on the forum and were going to make parts for the SRT but then it never happened. At least LET has made stuff and stood behind it. All companies have some teething problems in the beginning, based on what I read on this forum with other companies, I would use LET again without hesitation.