Off road, I along with most of the club used staun deflators. Since four came in a pack, I had two set for normal off-road (20psi) and two set of hard-core (14 psi). One thing we found out, is make sure you have an air supply available when airing down since every once in a while, one will stick. (Maybe one in 1,000 air downs).
I've been thinking of getting another set with higher max pressure to set my truck's unladen pressure. Figured the convenience would be enough to drop them down more often than running at 80psi all the time.