I have the cheap kit one. Paid less than $10 for it. It works. I use it for spraying Future. I could care less if it breaks. It came with a vinyl hose and 2 bottles that were worth the $10.
But they aren't very good, and I wouldn't try painting any camo with it. I'm sure it could be done, but what a lot of work when it doesn't cost that much more to get a better airbrush.
Harbor Freight is much like Princess Auto is here in Canada. Cheap, cheap tools. I've bought pliers and a hammer there, some cables, some wheels for utility carts. I don't think I would trust using their wrenches on an engine rebuild