My four love them and obviously look forward to sharing out the half-a-packet-load that I throw onto the carpet each evening. (If I'm going out, I throw them onto the pavement outside instead but that costs me more Dreamies because there are two cats from across the road who expect their share as well!).
However they still seem to get through plenty of normal food as well. (Typically 3 or 4 cans of Whiskas, or similar, each day, plus some good quality cat biscuits, plus whatever they can scrounge off my plate. I wonder why I've never got any money?)
;-)