I used these for airing for the first time last weekend and found the following: Run it to the max - They are solid brass - Work perfectly as intended and don't shine as bad a "fit" as the cheap ones - they deflate quickly (quicker than other jeepers who do it manually or with a valve (base kit) - the first one was done when I installed the last one on the opposite side - Comes with a leather storage pouch with a different mechanism Minor cons: - No markings for on-the-fly adjustment (Some round number markings would be nice for on-the-fly adjustment) - According to the slow TPMS system on board they had Tires 16-17 psi when they were finished (although the tires were warm when deflated). read them. 18psi from the factory seems like too much h to me and we lost track clearance a bit. Some markings on the deflator to show round numbers like (30, 25, 20 etc.) would be great to get a general idea when measuring your losing terrain. .