Ours is a Kenmore with that feature. One day I got frustrated with our vacuum cleaner for being too loud, mostly, and so looked for the best rated model. I think Consumer Reports rated the Kenmore as about the best, IIRC, at least for the money. It might've been only slightly less quiet than whatever we had back then, but it does work pretty well.

I still think there's a market for a vacuum with a super quiet motor, even if it costs considerably more and doesn't otherwise work any differently. I thought Dyson could become that maker, as I hear they make a high-end hair dryer that's quiet. However, the Dyson hand dryers in public rest rooms are anything but quiet. I hate those.