I'm another one in the electric camp. I just bought my first one a Blue - something or other, 1900 psi, made in Italy that gets good reviews on Amazon. Regardless how careful I think I'm being, the powerful gas ones that I've rented end up with me having to repair or paint something that did not really need it (yet). I've used this one a few times and it cleaned really dirty concrete slabs, and a metal roof, albeit rather slowly. You can run this pretty close to the surface at this limited pressure and maybe only clean a 3" swath, so it's slow. But when you're done, there's no repair or painting. I simply felt I could borrow or rent a big machine if needed. If you go gas, here's a tip that you no doubt already heard - BUY ETHANOL FREE GAS, ADD STABIL RIGHT AWAY. My yard and garden tools, mowers, chain saws, trimmers, mini-tillers, have performed flawlessly even after sitting for months by going through the trouble to find the right fuel.