I just spoke to a sales rep at Performance years about a new harness. They sell the both the M&H and American Autowire harnesses interchangeably. He says that the American Autowire guy split off from the M&H guy and they're basically selling the same harness. I asked about having to crimp and solder things and he said they are both plug and play..ready to go. If that's the case, I guess it would be hard to go wrong either way.