Nope, no air doubler demo at OKC last year. You can see a picture of my installation earlier in this thread, and still very happy with it.
I do not have any problems "topping off" my tire pressures, the highest of which are my steer axle tires at 115 psi. Doesn't take long at all, however, I have never tried to fill a tire that was flat. You can easily top your tires off to 120 psi if need be. I used to haul around a small pancake compressor but that still struggled to maintain 112-113 psi in the front tires.