Familiarity: I've used it once or twice and have initial impressions
I was looking for a very small CO2 inflator for my mountain bike kit that would enable me to adjust the flow of gas. After testing this a couple times at home I decided it would not make it onto the trail. I found it difficult to: 1) attach the CO2 cartridge to the inflator without leaking gas; 2) control the flow of CO2; and 3) remove the inflator head from the valve. That being said I guess it technically works. My favorite inflator so far is the Lezyne Control Drive, which is vastly easier to use and control than this product.