My TAP shift will not upshift automatically in M, it will ride the rev limiter until I hit the button. It will downshift automatically but not upshift. I use mine every day because I drive a curvy mountain road and I can downshift before getting on the throttle which really helps launch out of the curves. It also keeps me from constantly shifting in and out of 4th and TCC lock like it does in D. There are hills that I know I will downshift on and with the TAP I can DS before I even start without taking my hands off the wheel. I can see where in most driving situations TAP would be completely useless but where I drive it is wonderful. Mine is not slow, maybe because of my PCM Tune, I dunno. Also, something worth noting, I get 3 more MPG making my drive to work in M than I do in D, and I tend to drive it harder in M.
Sorry to continue the thread jack, this just hit a nerve with me
