Any Problems With Atlas Storm Master Slate Shingles?

I have a customer that really wants to install an Atlas Storm Master Slate roof on his house. The distributer speaks very highly (of course) about this product. I have heard about past problems with Atlas shingles, but nothing about Storm Master. Does anyone have any thoughts on this product or the company? Should I stay away from them? Lets face it, I could probably find some dirt on every shingle produced. If there is an issue and the company takes care of it, I can live with that.

We have sold and installed hundreds of squares of them, including on my business partner’s house, and have never had a single issue. (this is only about 3 years into using them tho, so long term, I can not speak)