I've had one since late December; I'm a big fan. Turning the dial and having it auto inflate to your chosen spec is great. It fairly loud as expected, but it's lightweight and handy to have around. I nearly filled 4x dead flat SUV tires on a single charged 2a battery... It got to about 25psi on the last tire before it died.
It also plugs into your car via 12v which is a bonus alternative.