When I was using my old (really old) Aztek 220, I would hook my 1/2oz MM bottles right to the fitting and spray away. I had special "airbrush only" bottles of paint, already thinned and ready to go. I was considering doing this with my new Paasche H (once I get a 1/2oz adapter) as opposed to using the color cup (which is a little awkward, but I'm sure just takes getting used to).
Has anyone else sprayed straight out of the bottle (I guess any brand, doesn't have to be just MM), or do you prefer the color cup?