I've had Karcher and Nilfisk and they work OKish while they last. The trouble is, they don't last for longer than a couple of years as they are cheaply made from cheap components. A couple of years ago I bit the bullet and bought a proper Kranzle pressure washer. The difference is like chalk and cheese, Kranzle spend their money on engineering, not stupid TV adverts. It just works brilliantly. The only problem is the price.