Never heard of them, but their warranty looks pretty good. Have you talked to anyone using their converter?
I've had many converters built, but only for drag racing, and since the early 70's they have all been Powerglides.
I'm assuming they asked you a ton of questions about your car to determine which converter would work for your application, like HP, TQ numbers at peak HP, gears, tires, and whatever other mods had been done with the car. Also, was there any discussion about a "loose" or "tight" converter.
Choosing the right converter can turn your car into a rocket ship or choosing a bad one can turn it into a lead weight..........IMHO
Circle D Specialties Pro Series Stage III Multi Disk Performance Torque Converter for the Ford 6R80