Seem to be a real miss-match with the Karchers, I think the HD series are all pretty good but the K series, some seem to have loads of problems with them pulseing and breaking every few months etc, but i've had 2, first one was a Karcher Refurb, payed £30 for it and it lasted 7 years, now got my k2.56 and had this 2 years without any problems.