We bought a SharkNV801UKT DuoClean True Pet Powered Lift-Away.
Our 15yo Dyson finally died. It was a very good cleaner, but a heavy beast of a machine, and fiddly to use. I'd used a Sebo elsewhere, and had been very impressed with it, especially how easy it was to pull out the handle and use it as a 'wand'. But when I looked at Sebo again, I realised that they were just as heavy as a Dyson to lift and to push. Previously I'd lived in a flat, and had not had to consider weight. Now I live in a house with carpeted stairs!
The Shark is incredibly easy to use, and very flexible, too. The handle just lifts out to give you a short or a long wand. You can lift the motor/canister unit off completely, and turn it almost into a cylinder vac. It's very light to carry around. Vastly easier for stairs. Only criticism is that the canister 'wants' to lie down on the stairs, and I don't know whether that's OK. I tend to end up tucking it between my leg and the wall.
It doesn't pull out carpet fibres. Carpets shed massively when they're new, and the stuff that collects in the vacuum cleaner is the same colour as the carpets for a few months. Eventually they stop shedding and the dirt is all gray, no matter which room it comes from. The dirt in our Shark is gray, except from the room with the newish carpet, which is still tinting the dirt.
It works well on our hard floors, too. Has a sort of squishy roller that seems to be more effective than a brush on hard floor.