automatic transmission

[GM Muscle]

i plan on running about 450-500hp and was wanting a 700r4.
My question is: has anyone used or heard anyting about this trans?

http://www.jegs.com/i/Performance+Automatic/732/PA70102/10002/-1/818283%7C10559

I was also concidering this stall:

http://www.jegs.com/i/JEGS/555/60436/10002/-1/759966%7C10555#


any input or advice before i spend this money would be appreciated!