After much indecision I ordered a Air Tower 5 today. I hope it's as great as advertised.
Its awesome.. on a road tire, with the volume setting down, you can get it up to 60-70PSI pretty easily before it gets too hard to pump. Switch it over to the pressure side and it pumps pretty easily and seems to average about 9 PSI a stroke. It says 10 strokes to 100 PSI and that sounds about right.