I love this mini inflator head, it's the smallest I've found. It doesn't have a trigger or pump action, just the simplistic twist to tighten and then twist to release mechanism that you'll find on cheap inflators. You'll want to make sure you have to proper cartridge size for your PSI. As with most of these, unless it fails catastrophically pointing to poor build quality, most folks' gripes with CO2 inflators come down to user error (which I have plenty of experience with myself). It does get excessively cold because of the physics of such a small head, but it doesn't freeze your fingers unless you manage to pop it off the valve stem. As always -- sacrifice a few canisters at home when learning a new system. You'll want to know you can air up consistently instead of being stranded.