Why is Dyson doing so well?

I’m sure you’ve heard of the Dyson vacuum cleaner, or seen one of the commercials on TV with the earnest inventor himself, talking about how other vacuums lose suction, but his doesn’t. To be honest, when I first heard the ads I was skeptical. I had never really thought about vacuum cleaners much (who has?) but I didn’t think that all existing ones lose suction. What annoyed me about most of them