G'day folks,
One thing about all of these units is, if you need to thin the paint with actual lacquer thinners, forget about them.
Edit: Just re-read the instructions for the Aldi unit I have on hand, and any paint with the red 'Class 3 DG - Flammable Liquid' hazard diamond on the tin, is verboten.
If it's an enamel or oil based paint that can be thinned with mineral turpentine, they do work, but the finish isn't up to motor panel standards, by a long way.