Good concept, but can't imagine the authorities in this country allowing it's use anywhere unless you own a farm with plenty of fields :-?
This is an excert from the Questions and Answers section of the ad - hilarious

Q: You have no idea how excited I am about this vehicle! For some time now I have been tormented by my conscience and only now after seeing this auction realise my true destiny! The streets of Cheadle Heath, Stockport, England have been taken over by scum and filth and need cleaning up! With your help I'm going to do it! As such, my identity is top secret and I spent all last night making my crime fighting costume from brown potatoe sacks & fire brigade wellies! I tested it this morning by putting the rubbish out for Mrs Moulton and repairing a puncture in one of the local kids bmx tyres and neither of them recognised me! Should I win your auction, I am going to paint the M400X brown and anchor 8 20ft lengths of rope (made from sisal) at regular points arount its perifery and tie knots in them for knees and feet. Then in the evening, I shall flit about in the air, striking fear into the hearts of my enemy, before scorching them to death with my thrusters! Love..Daddylonglegsman.AKA Walt X
Oct-13-06
A: The downwash air temperature of the M400X prototype is only about 4 degrees higher than ambient conditions. Hope this doesn't put a crimp in your plans.