I've had one of those Karchers for about a year. I bought the one without the little carrying rack, though. It's about $50 cheaper, and the same unit otherwise. The washer is very effective, especially that rotating nozzle; that thing will hurt you if you get your hand in front of it.
I have had a lot of trouble with reliability. I'm on my fourth unit now. On the other hand, Loewe's has been very good about simply replacing it. I just take the thing down, in the original box (so save the box and everything else; staple the receipt to the box), and they give me another one. The first one lasted about three months, then started to leak. The second and the third would cycle on and off while you were not using the wand, and only lasted a couple weeks each. This fourth washer has lasted about eight months, with no problems. I have already saved the purchase price by avoiding the car wash.