When you need one of these you need it to work simply, reliably, and with some control. You get all of that with the PDW shiny object CO2 head. If you don't want to worry with carrying the little leather sleeve in your flat kit or saddle bag just use an old inner tube cut to length as a sleeve. This will keep you from freezing your hand. The dial allows you to control the flow of air so that you don't just blow the new tube or pinch flat straightaway. This is the standard for CO2 heads as far as I'm concerned. Get two!
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.
I've had this inflator for over two years now. Looks like it's been to hell and back, because it has, yet still performs flawlessly no matter how beat up it gets. It's the most straightforward, easy to use design out there, it's simple and incredibly durable, and it's super light. There's no reason to even consider a different inflator. Came back to pickup a new one as a backup so I don't have to always remember to swap one between bike bags... because I doubt the older one will ever die.
Been using CO2 for a number of years and some of them work better than others. This one is solid - all metal. The ability to gradually feed in the CO2 with the dial makes it much easier to operate. It still gets a bit cold, but all of them do.
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).
Not unlike other all metal inflators this works good but gets so cold that I couldn't turn it off or get it off my tire even with gloves on