I bought the DC01 on an uncle's recommendation - I hadn't seen any ads for it. His family have a lot of dust and pollen allergy problems, and the Dyson worked like magic for that. He used to cart it back and forth between Edinburgh and Sutherland, but eventually opted to buy a new one for Edinburgh, and leave the old one up north. My son and daughter-in-law liked our Dyson and bought one after their first, non-Dyson, found itself unable to cope with cat and people hair. Most of my cousins have them, too.