Yeah enamels definitely require a different technique. They tend to spray out thick and fast, and are more prone to collecting airbone dust. I can only get Tamiya sprays if I drive an hour, so I've been using testors/enamel sprays for the past 5 years or so.
Yeap, Model Masters, Testors, and Colors by Boyd are all the same. Only, it "seems" testors spray cans have horrible nozzles, while model masters have better ones.