i still use mine for certain work, it is definitly not a usless invention, remember you can use the karcher for cleaning up after trad on inside cills ect, i bet karchers next one will be cordless, they have sold millions of them, the best tip i can give is, change the rubber to an unger soft, this is the best, as it is very soft and lets you right to the bottom of the frame, even with long cills,