Yes, you can indeed compare Apple and Dyson. Look at the packaging on both products and they fonts and literature used is vey similar. When Jobs was alive, he and Dyson would send each other their newest products as they both admired each others companies. Say what you like about both companies, and I am no Apple fan, but they have attacked a certain market and people buy their products in bucket loads, despite them being much more expensive than nearly anyone else.
I really can not see a modern day Hoover, or Vax, or Shark lasting 10 years. If this is the TTI Hoover, then no way. I would have said something similar regarding my Vax and their 6 year warranty which sounds amazing on paper, but when you look into it, it is more trouble than its worth. Their customer service efficiency is lacking and what is and isn't covered isn't clear, and at best is mechanical. Dyson covers you for hoses, belt and broken accessories (pipe, bins etc) that is what the dyson guy told me. They stand behind their products that much, and their customer service seems incredible.
You are paying for those patents which make a dyson, a dyson. Dysons have the most efficient cyclonic system, probably the most effective hand tool on the market, the best swivel steering available (yes I have used Miele S7 and I have a sebo felix, the dyson is more versatile)
Most people who have Hoovers, Vax or Sharks have them for 3 or 4 years at a stretch before the things fall apart. A colleague of mine had a MR LIFT AWAY (Shark navigator lift away) and nearly exactly 1 year later, the hose to the head split, which is a £40 replacement. That is astonishing. A 3rd the cost of the entire cleaner.
So no. It isn't as black and white as "oh that costs £400, this one cost £200 and it does the same thing2. More often than not, they don't.