I think you being pretty negative about a great aftermarket performance part. I thought they were overpriced and then found-out the quality of them and time to hand make them. I am glad to have a set.
Everyone has an opinion. Here is my experience. I had one leak at the extra joint on the drivers side, no burnt plug wires, and a great increase in performance. I am sure I didn't get that joint tight enough on install and I did not go back to it. The header bolts have held, but I re-tightened them as you should at least a couple times after install and good heat cycles. I keep checking them till I cannot get anymore of a turn on them. This has worked for me across several headers with a good metal sandwich gasket.