I used one on every residential job that I had for years. I first started cleaning @300psi with it and had 30 minute dry times. It was slow at that psi. I turned the pressure up to 600psi and cleaning got much faster and dry times were 1-2 hours. I am able to clean much faster with the wand than I can with any rotary extractor, so I needed to charge more. When given the choice to pay less with 4-5 hour dry times or pay 20% more and get 1-2 hour dry times, most of my customers were choosing the lower price."