Strong suction, good seal, and once you look up the product and get better instructions that tell you how to turn it off quickly you're all set. Only thing that would make it better is a pressure gauge and if it would regulate to a set pressure rather than keep sucking till you turn it off or hurt yourself.Do pay attention to that, hold the button to turn it off if the pressure gets to much, because the button isn't a pressure setting, it's how quickly it pumps. So if you turn it on low and ignore it, it will create enough pressure after about 2 minutes to actually be remotely dangerous, I checked with a gauge and it was pushing past 12 in hg