I have one in the 6MT flavor and it has been fine for the 10k miles or so (~300whp). Heavy pedal effort, but grabs like there is no tomorrow. Was loud like hell for the first 1k miles, but it has settled then. Still has some decel noise but livable.
For my 2nd 6MT swap I am wondering whether go with it again or FX300/FX350 for a change...