I got one a couple weeks ago and I've used it to top off a few tires and inflate some bicycle tires. It's pretty loud but it works great, and the built-in digital pressure gauge is nice -- no swapping back and forth between the pump and a gauge. The auto-shutoff at a certain pressure seems like a nice feature but I haven't used it yet.
Some of the reviews on the Sears site say that the pressure gauge overestimates the pressure, but for me it agrees with the cheapo gauge I have (although who knows how good that gauge is). It's also nice to be able to just walk up to each wheel and not have to think about cables or hoses getting tangled up.