I'm another LNF owner and may be persuaded to upgrade to V2 if turbo Cobalt SS's become supported. I'm not a fan of HPT - but felt forced into buying it when I didn't want to settle for GM's canned tune. With just a drop in filter and !cats, I got that little sucker to trap 109mph in the 1/4 mi...and that was with just a few air/fuel/spark changes & leaving the cam tables alone.
Still, after the years of positive EFI Live experience, HPT definitely lacks in the UI and it's a big turn-off for me. That, and their scanner is junk. I mean - you can work with it and the tuning software to accomplish what you set out to do. But, I'd rather have something that's a lot more professional at the end of the day.