The inflator works well - push the chuck firmly onto the tire, and the guage shows the pressure. The trigger and air release buttons make it easy to get the right pressure, and I think that the guage is quite accurate. The only problem is that the spring-loaded clip that holds the chuck onto the valve stem of the tire can interfere with certain rims. The unit I received looks slightly different from the picture here. On mine, the lever for the chuck is mounted inward, that is, on the same side as the chuck air hole. Depending on how cramped the space around the valve stem is, you may not be able to release the lever with the chuck on the valve. To inflate the tires on my VW Passat, I had to flex the valve stem quite a bit to create the necessary clearance. Not a terminal problem, but one that could so easily be avoided by putting the lever on the back of the chuck, or as it is shown in the image here.