I saw a huge benefit.

Caught some minor stuff during break in...tweaked it,,,and got the optimal power out of it..while on the dyno...well worth the money to me....

then when i dropped it into the car,,,i knew everything was fine,,,and didnt have to go thru months at the track of trying to figure out various problems,,,I think it saved alot of headache,,and perhaps time/money to get it right on the dyno,,,