I"ve got the tiny little Crank Bros. Power Pump, and I like it. Used it once out on the road, and twice at home (put new HOT PINK tires on my bike!) and it works fine. I've read a lot of reviews from people who couldn't get it to work, and it sounds like they're not pushing the nozzle all the way in. I like that it's small enough to fit into my small seat post bag.