The bathroom hand drier they invented is/was cool. No heat and knocking the water off with a faster jet of air by pushing it through a smaller hole was a decent improvement.
I prefer a simple paper towel dispenser or if you want to be more sustainable one with a reusable cloth towel "ribbon". But yeah the Dyson driers are better than the heated blowers.
I remember seeing studies showing how unhealthy it is because germs are spread in the air when using it. I assume this is the case with competition too and not Dyson specific.