This thread is amazing.
Dyson is the best vacuum I've ever hard. I suffer from terrible allergies and have two cats that I refuse to give up, so I have DC47 multi floor and bought all the extra animal attachments so I could properly clean any upholstery. Before buying the Dyson I had a Miele which I thought was working properly, but just like everyone else here, the first time I used it I was really amazed (and disgusted) with all the extra fur and dust it picked up.
When I moved to Europe last year, it was the first thing I replaced and when I move again in the fall, a new one will be waiting for me when I get there.
They are definitely expensive but if you suffer from asthma, allergies or have lots of pet fur flying around, they are the best.
