I bought the craftsy airbrush class with Lisa Berczel and found it really good. She goes in to a lot of detail about different types and styles of airbrushes and compressors, how the airbrush works, how to use it, how to clean it and how to problem solve. I especially found it useful understanding the mechanics of the airbrush as I have been using a cheap one for a while and have just been aiming and shooting. Understanding 'Why it is so' helps to lead towards more refined practice for me. I am actually sitting on my hands in excitement because I have just bought a Grex pistol style airbursh and it is due to arrive in the next 2 days. For those with no airbrush experience I would recommend that they purchase the craftsy class and watch it before they make a decision on what sort of airbrush to buy.