I bought about 60 converters over the years for customers... I tried many, Dynamic, PTC and ended with Edge. Dynamic took forever to order and I wasn't very happy with my converter (to high stall), PTC was good till they messed up a thread in the converter that cost me 6hours of work. They did tried to help me as good as possible, but the 6 hours just made me search for another company.
I found Edgeracing converters and I have to say he makes MUCH better converters, he really know his stuff, he always tells me what he does, why he does it, what I will expect and it always matches! He also offers an awesome service! I feel by far the best company I ever dealt with in the US and the better converters I had from PTC (I bought around 20 from them) But that's my opinion...
About TCI, Mopar & B&M I won't even talk they are so bad!