tire deflators

[kalantar]

It would seem the Stuuns seem much easier to use. In the video it took him a minute to deflate the tire 13 psi. That would take 4 minutes for all tires , plus the PIA of kneeling in the mud or dirt while doing it. I have 37" Toyos, which I deflate from 50 psi to 20 psi , I am assuming with the device it would take 2 minutes per tire. With the Stunns you can walk around, screw them on and walk away and it should be done in 5 minutes for all 4?

What am I missing?