I only recently had reason to pay attention to this particular subject and despite all the negatives about AC in Texas, I have yet to see any details as to why they have this reputation.
Couple of months ago I bought an AC 9.5" LU from Jack Cotton w/o thinking about real or not-real AC. 2 weeks later I had a failure that led me and everyone else to immediately blame the converter. Jack put me in touch with Dan at AC and I have to tell you that was a very pleasant and surprising customer service experience. He asked that I return it and promise to do everything necessary to make it right if the converter was the problem. To MALSS, they found nothing wrong and returned it at no cost. No big deal, I expected no less. Turns out the problem was my tranny front pump and since that has been corrected everything has been working flawlessly. MOF, the performance has been nothing short of spectacular!
If I was unaware of the "real AC" situation, this converter and the service I received would have been highly recommended based on my experience. This is the same situation I had with my PTE-51 which worked flawlessly and was still in like-new condition when I pulled and sold it. Are other converters better? I am sure they are and cannot imagine it since I think this one is very good. Based on the service I received, I cannot imagine the same person treating another customer differently.
All I am saying is if there is real basis for their reputation, let the rest of us hear about it and not just the label pinned on them or anyone else.