My expectations were exceeded. I mid 70s; wife in early 80s; I no longer have to drive to the gas station, inflate 8 blocks, which gives me maybe 2 minutes of air; Sometimes I wouldn't finish all the tires in the allotted time. NOW I can check the pressures on all the tires on both family cars from the comfort of my shed. The GREAT thing is that you can set the pressure you want and the machine will stop working automatically when you reach the set value. Knowing that all tires are set to the exact pressure you need is VERY CONVENIENT. Airing my tires used to be stressful; now it's a pleasure.