Our local transmission shop owner calls his 10 bay shop "the house that GM built'. Specifically he means all the 700R4's and 4L60E's that were rebuilt to pay for it versus the few other brands, Ford, Honda, etc. that came through. Given that kind of reputation, familiar to every single transmission shop in the US, I don't quite see how people find these particular units so desirable. I can kind of see it with a TH400, one of those is kind of like a C4. A quite respectable amount of power handling efficiency in a compact and fairly lightweight package. But a 700R4, not so much. Obviously there's something there or they wouldn't be doing it. But I don't get it.