I am surprised by the negative reviews. I have been using this pump for over a year and a half (I ride daily, about 9,000 miles per year), and have not had any problems with it. I often help inexperienced riders, so I've used the pump often on other people's flats. Things I like: 1) it is compact and light. Yes, that means that it is low-volume when pumping, but that is an acceptable trade-off for light weight. 2) The head is dual (Schraeder and Presta) 3) The head threads on to the valve, which makes for a secure attachment with very little air loss during removal.. 4) The head is at the end of a short flexible hose, which makes inflation much, much easier.