I used to vacuum daily with my old vacuum cleaners and was shocked at the debris that they left when I went over my floors with the Dyson.
The air smells better after using the machine, and it was only after observing that that I realized that my old machines must have been leaking fine particles of dust into the air or something.
It is great to be able to see the dirt collect in the canister, which is really easy to empty.
I love my Dyson.