I've had a chance to use this several times in the past month and it works great. Easy to operate and modulate the flow of air when inflating the tire. Takes less than 30 seconds to inflate your tire once you get a new tube in place. I carry two new tubes, several glueless patches and two air cartridges in my seat pack. Love it.
Many of the other inflators have let me down on the road, and isn't that when you really need it! The leather holder is functional and cool. The adjustment knob works really well. It allows you to control the flow.
Well constructed. I really like the compact size and the dial feature to control the flow of CO2. I usually only carry one or 2 cartridges on a ride, so blowing one on a misfire is a big problem. This is actually the second one of these I've bought. I've got one in a saddle bag on a cross bike, and now on in my road bike's bag as well.