I've seen how more than one brand is built, as well as building them myself. There are many good reasons we at Black Mountain chose DTT. The biggest reason is one that counts the most, their unrivaled level of customer satisfaction. With that many satisfied customers for so many years, you know they're doing something right.
The single-disc DTT Storm torque converters are unlike anything else on the market. (if these TC's hold behind upwards of 750HP and in sled pulling trucks, without slipping, why do you need three discs? )
The torque covertors are built in a huge, modern, new, state-of-the-art manufacturing facility so well-equipped, clean and organized, that it would put most NASCAR shops to shame, and they have more CNC machines at their disposal than I could count. They are built to Bill Kondolay's specifications, and are his own design, but factored into that is the huge amount of engineering expertise and mechanical experience of the company that makes them. This is not the same as TC's built in the corner of a transmission shop.
Tighter tolerances and accuracy are a benefit to having them professionally manufactured, as opposed to homemade.
A DTT is not simply a TC and valve body, but a complete transmission, no part of the transmission is ignored by Bill or his dealers. Tolerances, internal leaks, clutch material, everything is repaired or upgraded so it all works together to give the customer his or her money's worth.
Words on a computer screen are never enough to express the satisfaction DTT customers have with their trannies, and the customer service they experience.