You are correct regarding the Dyson poor brush design. Much of the "dirt" that it appears to be sucking up that the Miele "missed" are actually carpet fibers that are ripped off from the carpet due to the overly stiff brush design. That's why the see-through tube fills up so quick. I don't believe this is true. When I have vacuumed with my DC14+ the canister is filled with dirt and pet hair, no carpet fibers. I've done enough cleaning to know what carpet fibers look like and that is not what is coming out of the bucket.