Can't answer about your airlift system question, but in regards to the feedback:
I've had the kit now for a little over 10k miles, with a little mix of everything. Very happy with the kit. Had the guys at Eibach install and align the vehicle. Factory UCAs are being used and haven't had a problem, or signs of uneven wear on the tire. No tracking issues on road, freeway, dirt, etc. Last week, did change over to 285/70/17 Ridge Grapplers (standard load). Also still running the factory Trail Edition wheels, so I don't have any rubbing on the front bumper and didn't need to do clearance cuts. (i had a coworker with a Pro get the Terra Grapplers in the same size, and he had to make all sorts of cuts to clear; probably due to the different offsets of the two rims).
I only get a slight rub on the mudflap on that nub the protudes out in the front wheel well. I'm going to try to make sure it's fastened down, cause it seems like it just floats there and that's what catching. It's only rubbing on an inch spot and it's intermittent (depending on compression, tire temp, speed, etc).