The Staun deflators look great! I like the idea of screwing them on and waiting, rather than tending to each tire for 5 minutes at a time.
Questions...
Are they consistent with the setting you put them at? I mean, once I get them adjusted to 18 PSI (or whatever) do they reliably air down to that pressure each time, or is it sometimes 16, sometimes 20?
Is it ok to drive, a little, with them on? Could I stop a mile before the trail, install them, and drive up to the trail with them on? Is there a risk of damage or inconsistent results when doing that?
While the ARB pressure gauge looks good, it still means going around and sitting at each tire for a few minutes.