Parks 4x4 did a deflator comparison a few years back, the EZ-Deflator (which ARB sells under their name) was actually faster to air down 4 tires than the Stauns, not by much but about a minute. I had a set of Stauns and I like them... however I ended up setting two at 12 psi and two at 20 psi, which doubled my air down time and still left me with only two options. With faster speeds and infinite air down pressures, the EZ-Deflator is a winner for me. The Oasis deflators are hands down the fastest as you can drive with them installed so you screw them on in the parking area and pull them off when you get to the first obstacle.