Really good, but fragile. I'm not sure if I could ever pump a kite again. It is amazing to be able to have my lines run and connected while this beauty pumps the last couple PSI into my kite. The PSI auto shut off works flawlessly, and it is awesome for sucking all of the air out of the bladders for travel. My only issue with the device is how little waterproofing there is for a device that is used outside/near the water. I have already destroyed 2 with literal water drops, so I travel with it in a waterproof bag. The pump goes in and out of that bag only to pump up the kite. This device is too valuable to have it fail mid trip!