The Aquatak 110 Plus is very easy to use - once you've actually put the bits together and connected it up to the mains and water supply. Multi-lingual manual with an emphasis on pictures wasn't a great deal of assistance. Just used the machine to pressure-wash a dirty estate car which had been treated with Swissvax wax 4 months ago. The dirt came off very easily, just using water. Even brake dust from the alloy wheels and mud and grime from the wheel arches and underbody were easy to shift. The Aquatak didn't strip the wax either (don't use detergent if your car has been treated to a quality wax, as the detergent will remove the wax!). Result - a nice clean car after only 15 minutes work.
PS No longer happy - the unit broke down terminally only weeks after the warranty expired, and was uneconomic to get repaired. I bought Bosch thinking it was a quality brand - now I'm not so sure. The cheaper Nilfisk pressure washer bought as a replacement isn't as versatile but still does a decent job - & so far it hasn't broken down!