I have not installed either one, but I have had the opportunity to use the QuickAir2 after running around with a huge group down at TruckHaven. It did okay for airing up, but the duty cycle is failry low at only 20% so we should have waited 20-30 minutes between trucks.
The QuickAir3 will output a ton more air,but the pressure is fairly low so if you ever want to run air tools using a reserve tank, you can't.
Also, anything over 5 gallons of reserve tank volume will void thier warranty.
If you think you will ever need more air, more pressure and more volume, check out a continuous duty compressor. There are two fairly popular ones. The first is the Thomas (same as that used on the Hummers) but it runs $500. The next one is called the ExtremeAir. It is $379 and available at http://www.extremeoutback.com/catalog.htm and scroll to the very bottom. When I can affor done,I will be getting one of these (if no the engien driven one they also have)
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Jason B.
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