I wonder how this compares to say a Honeywell HEPA air filter, in air filtration capability. The older Honeywells have a very large HEPA filter media with a carbon prefilter. While the features of the dyson are interesting, I have to say the price is a bit expensive. I don't think I could justify that price for a hot and cool fan with a built in air cleaner.
Do you notice a big difference in air quality? What's the warranty on the unit?