This inflator is an improvement over my old one - it does all the old one did at a tiny fraction of the size. I was using an enclosed-cartridge inflator that used cheaper threadless CO2 cartridges. I realized at 2-3 flats per YEAR, the savings weren't worth carrying my old bulky inflator.
Haven't *needed* to use this inflator yet, but like all ride-critical tools, I home tested it, "wasting" one cartridge. It worked just fine. The valve on the inflator was easy to operate. The cartridge DOES get seriously (dangerously?) cold, but wrapping it in a cycling glove solves that problem.
Even though I carry a frame pump, there are times when a CO2 inflator really helps: Instant pressure, no pumping. It's an "insurance policy" for me and it +a few CO2 cartridges will fit nicely in a small underseat bag.
I have more than one of these because I like to keep one with me on each bike. It uses the screw in C02 canisters and allows user to regulate air flow, and to save some for later in the ride if the tire is still leaking.
I had a mountain bike tire with a bad tubeless valve, so I was able to refill it a couple of times in order to get me down the trail. They are metal and seem indestructible.
This is the only valve I've ever used that actually holds pressure after it's pierced the C02 cylinder. I've used the partial pressure after a couple of months of initial use. I use it and several friends use them as well, all have had the same good luck with these valves.
It works as described. I had a flat yesterday and busted out the Shiny Object. I screwed in a CO2 and inflated the tire without the internals freezing up and with super control over the CO2 flow into the tire. There also a pressure relief hole so once you back out the cartridge it doesn't want to take off like a rocket. It slowly and safely bleeds off the excess CO2. Worth every penny.
bought this in Jan 2015 - Used 3 times. First use - worked as advertised. Second use - had difficulty with turn knob and burned 2 co2 cartridges to inflate tire. rd use - knob kept turning and never disbursed CO2 - never got my tire inflated. I went through another 2 cartridges and still had a mostly flat tire. Luckly a buddy had another inflator which worked by twisting the cartridge to engage rather than a knob which just spun (open or closed).