I'm not an expert by any means but here's my experience. I bought an "expensive" devilbiss gun and I've bought several "cheap" Harbor Freight guns. My plan when I started was to use the cheap guns for primer and the good gun for paint. I found that I couldn't tell much difference in the results. I'm sure that professional painters can tell the difference but I'm just an amature. The devilbiss gun will cover more area so if I'm painting a large part I usually use it. The thing I like best about the HF guns is that I can get them on sale very cheap and when one gets a little nastier than I feel like cleaning up I just throw it away and grab another one.
