[Zeke]

Just like everything else, you get what you pay for. I used to be a painting contractor way back when. Airless sprayers have not changed that much. New stickers and names. Frankly, I'd rent if that's all the work you're gonna do. You can rent heavy duty units that will push all the paint you can handle w/o having to over thin the stuff. Smaller units will not paint well with many paints, like solid stains and vinyl-acrylic.

Here are some tips: Stain all your material after any thinning (5-10% recommended) into super clean buckets. Use a .017 tip with a 10" fan for vinyl and a .015 for enamel. Don't fan motion an airless gun. Act like a robot and keep the gun at 90 degrees to the surface. Overlap only as necessary. If you see "tails" at the edge of your spray pattern, your pressure is low or the paint is too heavy.

An airless is a wonderful tool in capable hands. But spraying is over rated. The amount of prep time, clean up, etc. can easy be longer that just diving in with a roller and a brush. Of course, acoustic ceilings are a perfect job for a spray gun. So is any rough surface, but I back roll the wet paint to work it it whenever possible.

Need more info, just ask.