We bought a cheap vacuum that I have occasion to use on a semi-regular basis around the house. Despite having recently done a bit of vacuuming with it, on borrowing my parent’s long-serving Amway vacuum cleaner, the difference was marked.
One vacuum cleaner sucks, evidenced by the amount of dust collected in this before and after shot. I would guess at several litres of the stuff.
The other sucks not so much – or at least it didn’t suck those several litres picked up by the first.