Spent some time tonight dialing in my new Staun tire deflators. They were a bit of a pain in the butt to get right where I wanted them but now airing down should be much easier.
40 psi down to 20 psi takes 2:35 for the tire I tested. I'm looking forward to testing them in a couple weeks when I have a wheeling trip planned. I'll update this after I use them again.
7/24/14 Update: Used them on my first wheeling trip. Dropped all four of my tires down to exactly 20 psi with no fuss. Used them on two of my buddies tires and dropped his to 20psi perfectly as well. So far so good!
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1999 4Runner Limited 4WD Locker
2006 Lexus GX470
2013 Toyota Tundra TSS 4WD