i felt the need to bump this again. i finally gave in and bought one. all i have to say is this:
i had tried a small 1 gallon pancake compressor, and it was just way too loud and didn't last very long between bursts of air. it also took like 3-5 minutes to refill enough to use it again.
i'm not hating on air compressors, by any means. if you have the money and the space, a decent air compressor is awesome. if you're tight on space then this little guy works wonders.
the only thing i don't like about it, is the loudness. it's like an overclocked vacuum packed into something as big as a coffee mug.