Preval paint sprayer, anybody tried one?

I've used them on small jobs like a couple engine bays and my rollbar, but I've found them to be very inconsistent and somewhat of a PITA at times. I used 5 refills just to do an engine bay so it would get rather expensive doing a whole car. IMO it would not be a good idea. Between the expense and inconsistency I don't think you would be pleased with the results. Not to mention you wouldn't be able to use your index finger for a week after mashing the spray head down a thousand times.