This pump works as advertised. It pumps air much faster than other water bottle sized USB powered pumps I've bought. According to the spec sheet, the charger lasts longer, although I haven't been able to test that aspect. One small issue is that the battery gauge shows very low power when pumping, but returns relative to what I was expecting. to where the load was before I started pumping. Not a deal breaker, just would be nice if the battery gauge was reliable when pumping.