Noone has it on a 6speed that I know of. It has been tested though and it performed wonderfully. The 6speeds get more power than TIP, especially on the low end. I know exactly what you are talking about in regards to the delay and weakness, the tune does an amazing job of taking care of that. The most gain is over 3k rpm, but there is substantial gain under that as well, in the areas you are referring to. It’s really difficult to describe, you gotta feel it for yourself.
Off the line? well for me it was like this when I floored it from a standstill:
stock off the line: pedal lag, slow revs, lots of noise and the car felt rather anemic until it hits 3000rpm, and it seems to die off a couple thousand after that. Still fun to do though.
jhm tune: tires slipping, instant power response, car surges forward, almost feels like a turbo kicking in when the torque converter locks at 3200rpm, huge sh*t eating grin, increased heart rate… I could go on.
Your experience, especially off the line will be even better than mine, you can’t go wrong man.