My Z-grip is absolutely amazing. We side-by-sided the pedal feel with my dad's bone stock 04 GTO and HE even admitted that my Textralia was slightly lighter than his stocker. After driving a Spec 2, 3, 3+, and RAM PG HD, I thought the Textralia was broken after the install. We actually went back and checked everything about the install and hydraulics to make sure nothing was wrong it it. It holds like a champ on my 5000 RPM launches on ET Streets and has about 9,000 miles on it. It is 100% streetable, way more than the 3 or HD, and even a lot better than the 3+ and 2, although the 2 had awesome street manners, as well.
I do agree that they seem to have problems in the high RPM, though. I've got a Tick Master on the way that will HOPEFULLY take care of this, although I don't get my hopes up anymore when it comes to dealing with clutch disengagement issues on these cars.