Every Tires Plus in town has 2 of the Castair units. The nice thing about the 2-stage units is that they spin really slow and they are quiet. Great for working late in the garage and keeping the wife from bitching that I'm making too much noise.
The single stage ones spin slower than others also, but they still have reed valves like the ones at HF/Home Depot/Northern Tool, so they make a bit more noise than the 2 stage.
A couple of my buddies got them and turned me on to them. There's *nothing* crappy on them at all. It's how tools *should* be made.
Now I just gotta figure out my air distribution. I'm not only going to do the garage, but run a pipe into the basement for hookups down there, and then stick a hookup out the side of the house so I don't have to drag 200 feet of hose from my garage when I need air out in the yard.