When it comes down to it, I find that this item is a little heavier than advertised. It was listed as 600 grams, but weighs 640 grams for the battery alone, plus 50 grams for the filler hose. Still, I'm very happy to have it. I went shopping to replace a floor pump that took 100(?) shifts to inflate my bike tire to hell and a ridiculously useless hand pump. This battery powered portable air compressor is a dream come true. Now I can inflate tires quickly and easily! Whenever I want! Up to a certain pressure! In seconds! Plus, you can use it to inflate anything you want, including car tires! I haven't taken it on bike rides, but it's not out of the question. Thoughtful extras are included, like a flashlight and a storage bag. I like that there are both car and wall adapters. So far I've only used a Schrader valve for bike tires and a needle valve for basketballs. The filler hose looks high quality. The battery itself seems to be very well made. For me it's a real upgrade to always have properly inflated bike tires. Definitely a waste but I'm enjoying it more than I expected. Two thumbs up!