Sean, thank you for all of that info. I went from not being interested in TackKey initially when I found out it was coming to the GT, to now being totally interested, largely based on your posts in this thread. If it really does end up being the basic equivalent of the Procal tune plus the lopey idle launch control, I'm going to have to do it! Looks like I need to come up with an extra $500-ish.
Just out of curiosity, will the GT Track Keys be visually different in any way from the standard keys? The Boss ones were red, weren't they?
2014 DIB Track Pack GT
GT500 Axle Back
MGW Race-Spec shifter
2011 SVTPP wheels w/ 275/40ZR19 & 295/35ZR20 Michelin Pilot Super Sports
Roush front splitter, 3D Carbon GT500 spoiler, RTR rear decklid panel
SR Performance 1.5" Lowering Springs, Oil Separator & Steel Braided Clutch Line
Stock Dyno Results: 375 HP, 361 TQ