There has been one in my 70 for the last 7 years, it has a 455 that pushed a 4100lb car with 2.93 gears through the 1/4 in 13.50 and the 2004R was in it at the time. That takes quite a bit of grunt to achieve that with a stock stall. It was a stock one from a Cadillac that I replaced the seals and clutch packs in. Nothing special done to it. I did get it to slip a bit with the ethanol for fuel, it makes quite a bit more bottom end and mid range torque. Would I run one behind a 600hp engine? No, not really. Behind a 450hp engine? Sure no problem especially if it doesnt have highway gears. With some upgrades they will handle racing even in heavy cars, but there is no need if you just have a cruiser.
They are a little bit stronger than breaking the first time you go WOT. But hey, what would I know? I only build transmissions, engines, rear ends, and entire cars.. right? ASE master certs dont really mean much in the real world.
You can hate on them though, I dont mind at all.
No I am not trying to be mean about it, just sayin.