I know exactly the shop that EtV mentions. A few years ago, when it came to buying a vacuum cleaner after our old Electrolux died, the first thing I did was to see what office cleaning firms use as I thought that what’s good enough for them would be good enough for me; almost without exception, they use Henrys. That was good enough for my wife and me. Most people that I have known, although there are exceptions, who have bought a Dyson based on the advertising hype have binned it after a couple of years because some of the flimsy plastic parts have broken and have bought some other brand instead. As well as having 3 Henrys, we also own a Miele (first class) and our daughters both have Henrys, one of them having binned a Dyson.
On the personal side, Mr D is hardly a poverty stricken inventor. His net worth in 2016 was put at £5 billion! According to Wikipedia, “In 2003, Dyson paid £15 million[ for Dodington Park, a 300-acre Georgian estate in South Gloucestershire close to Chipping Sodbury. He and his wife also own Domaine des Rabelles, near Tourtour, France, and a townhouse in Chelsea, London. His vessel Nahlin is the largest British-flagged and owned super yacht with an LOA of 91 metres (299 ft), and was ranked 36th in a 2013 survey of the world's 100 biggest yachts.” Although one shouldn't begrudge him his success, at least he is an engineer and inventor not a City wide boy gambling our money on the stock markets and his company does employ quite a number of researchers at their base in Malmesbury, I still think he is a self-publicist a la Richard Branson. For all the hi-tech nature of his company’s products, many are built down to a price and then offered for sale at an inflated price. The only exception that I would make to this comment is that the Airblade range of hand dryers are by far the best out there.