Are you cleaning, or doing paint prep? The really high pressure units WILL strip off any loose paint for certain. Even the lower pressure units will if the spray is small enough.
I was given a (Used) 1100 PSI electric unit, which is certainly not up to heavy duty use, but for general cleanup, cars and paint prep at a slow rate, it's been fine for two years.
I've cleaned the mossy crud off my driveway, and sidewalks, the same on my neighbors, and used both hot water and Simple Green in a cartridge on the feed hose to remove his 40 years old grease spot. We are about done with paint prep on the house, and making sure to widen the spray to a fan, and used it to clean my cars, and "sweep" my drive any number of times.
It's light enough that if desired, I could take it on the roof with little difficulty to clean gutters or prep the second story.
FWIW it's a "Clean Master" by Mi -T-M, no clue as to COO