At the moment I have the goods less than a week. So far I have adjusted the pressure on 9 different car tires. First, I made the purchase because my previous air compressor died, causing a tire that needed air to need more air. With this compressor, air was lost for a few seconds when screwing the connector on and off. One of the great things about this compressor is that it is MUCH easier to bolt on and off the tire. Very little (almost) air is lost when connecting and disconnecting. A disadvantage is the time it takes to add air. No wonder, because the electricity comes from a small battery and not from a large car battery or socket. It takes patience. (I usually sit on a folding chair to make waiting easier.) The big advantage over slow speed is that the product is small. It fits easily in the glove compartment. Battery Drain - I was able to add 2 pounds for 4 tires on a Ford Taurus. Over 50% left. I was able to add 4 Chevy Equinox tires 5 pounds each and it nearly drained the battery. Can't speak for longevity but plan to do so soon.