What issues did he have? Seems like a lot of positive feedback from them. Who knows. I'll switch them for steel if I don't think they perform like they should.
I helped him get a compression fitting to fix the leak he had and it worked fine. He told me he was in a rush to get it back together and thinks that he accidentally pinched it under his seat. In his unlimited car he literally sits on the belly pan. Such a cool car and an amazing driver!