Here's the link to a discussion on the
eBrush System Craftwell. I broke down and bought it, figured I could send it back if I didn't like it. It's not as smooth as a traditional airbrush, but it works pretty well. I use the Copics Airbrush System on my compressor and it works beautifully, but I can't use other marker brands with it. The eBrush works with quiet a few markers, so now I'm not limited to Copics. Honestly neither system is as good as a traditional airbrush, in my opinion, but they work pretty darn well.