Interesting. It was one of the most obvious purchases for me (I have the high end one).
It makes things SO much easier hassle free that I think other people who use the wired ones are strange.
Our houses are ~50m2-100m2 and the battery lasts at least 4 rounds of the house.
That's been my anecdotal evidence with almost every one I spoke to who has a Dyson or equivalent cordless.
I'm not interested in a cordless vacuum.
It's another battery to charge, so I'd have less flexibility of where to store it.
It's less effective than a corded machine.
100m² is reached with the cord plugged into the most central socket.
A €200 machine has so far lasted 10 years and still works perfectly.