Peter Spikings explained :
Aldi Lidl keep selling the identical unit for around £50 -£60 - I bought one a couple of years ago and it has given me good service. They are fine for domestic use, but the tank is small and the compressor not powerful enough for continuous use. Don't expect to be able to do any serious spraying etc., for that you need a commercial sized unit.
Rather than using it as a multipurpose power source, save the money to buy a proper vacuum and a proper pressure washer. Do not ever pressure wash a modern engine bay - the pressure can force moisture into the electronic and various connectors. Just gently spray paraffin around and rinse it off gently.