They aren't badly designed though, just have terrible build quality. That is the difference in my mind. Neither is excusable, so I'm not trying to advocate McAlister Audio. I just think there is a clear difference between someone like him and Ray or Rudi. Ray's build quality is absolutely stellar, but he tends to give you a poorly implemented power supply and a rehashed design that usually has some issues. Rudi seems to do things differently than other designers, and though I don't have the technical knowhow to debunk the designs myself, I trust Kevin Gilmore's opinion.
Also, though I love my amp now, I can't really say I've had good results from dealing with Peter. I certainly got a good initial price, but only through the hard work of many friends have I managed to get the amp to a point where I am happy with it.