I own two and neither is satisfactory. Both have a design flaw that all of these have. Nelson uses plastic gears for the propulsion and are prone to wearing out very quickly and are inherently weak and not able to pull much hose. Really no more than 20 feet without starting to strip, which causes the unit to stop moving forward. Nelson will gladly sell you new gears every couple of years for $35 and basically that's how they make their money. The first person who builds a replacement motor gear made of metal will crush Nelson. Paying attention competitors?