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I have a 2000 PSI Power Painter Plus. I would not recommend lower PSI versions because you will need to dilute thick, top-quality paints, which somewhat defeats the purpose of using top-quality paint.
The coverage is great. I painted a light-colored, interior surface a very dark color, changed my mind (or had it changed for me, if you know what I mean), and painted it a light color again. Each time took only one coat to cover the previous layer, which I considered rather impressive and virtually impossible with a brush or roller.
The speed is amazing; much quicker than a brush or roller or paint stick or power roller.
You do lose some of that saved time during clean-up. Clean-up is the major downside to using it. They really did not design it well for clean-up. There are lots of corners and crannies inside the unit in which the paint seeps and dries as you paint, which makes clean-up a real hassle. Thus, I only use it for larger jobs.
The aim is easy on complete walls or ceilings. I used a 3x1 foot metal guard that I held in my other hand that made doing corners amazingly easy. Because the spray only comes from one direction (on top of the gurad, instead of from the side of the guard), it does not bleed under the guard. It also has a low-pressure setting for more controlled spray areas. There is some overspray, but I attributed it to my inexpertise (spray only in the middle 2-feet of the guard, not near the edges). The aim does somewhat limit it to doing larger, uniform jobs. I cannot use it to paint the drywall between my exposed-beam ceiling without an undue amount of taping.
The noise is surprisingly loud (like a quiet school fire alarm), but not intolerably so. I have used it indoors with no problem. You can wear earplugs if it bothers you.
Also, you mentioned that you have cedar shingles, which would make the sprayer even better for you and really ideal for the job due to the irregular surface. Brushes and rollers take a long time to paint irregular surfaces, whereas it takes NO additional time with a sprayer You spray in side-to-side strokes and the spray shoots in about a 45 degree angle each way, even when tightened to a line, so the spray hits the surface from every direction as you make each pass.
I used the sprayer on a popcorn ceiling and some rough-grade, exterior siding with little indented canyons, and NOTHING works better. (Same for textured ceilings and walls). You can easily get at all angles of even the most lumpy, awkward spot of popcorn or texture, and you do not knock off any of the popcorn into your brush or roller. All while still spraying a nice, uniform layer of paint with no brush or roller marks. So it would be ideal for your job.
Note: Lowe's price was about $30 more than Home Depot's when I bought mine.
[This message has been edited by Lawrence (edited July 28, 2001).]