The thing I don't like about airbrushing acrylics is that they dry too quickly- sometimes in my airbrush! If I answer the phone, or get distracted for any reason, I risk getting dried paint in the airbrush. I have been told I should add retarder, but that makes it a bit more work than enamel. I also find I can get a better gloss finish, for models that require gloss, with enamel. I find that I can brush acrylic if I prime well, and I like the fast dry, but very seldom use acrylics except for a few colors for which I can't find a good enamel.