I don't know whether Dyson vacuums are really any better than anybody else's, I've never tried one, and they are kind of expensive. But I am impressed that James not only invested the time and effort to try and build a better mousetrap, but persevered long enough to build a company that manufactures and sells his vacuum. Too often it seems a company will introduce a product that is good enough and then proceed to make and sell the same device for a hundred years without changing any more than the color of the paint or the style of the logo. All investment goes into marketing, none is spent on research and development. I suppose sex appeal has a lot to do with it. Isn't a vacuum cleaner just as sexy as a hot rod or a jet airplane? Well, maybe not.
Remember, there are two sides to the free market: on one hand customers are going to be looking for the highest quality product for the lowest possible price. On the other, in order to make a profit (i.e. make it worthwhile to continue in this line of work), the manufacturer will want to deliver the lowest quality product for the highest possible price.