I have a very poor opinion of anything that alters the shift strategies of a valve body. I've seen far too many serious driveline and rear end failures caused by the tendency for a shift kit equipped transmission to momentarily lock up in two gears at once on a full-throttle downshift, causing universal joint and/or rear end failures. A high stall speed converter creates a false neutral condition due to slippage, then slams into engagement at every stoplight. Both these modifications are for drag race only applications, and shouldn't even be considered for street use.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!