I borrowed a dyson vacuum once from a neighbour. Despite using it to vacuum my apartment after already having used my own vacuum, it filled up almost instantly with stuff my personal vacuum left in the carpet.

My current vacuum is a V15, and I like it a lot. It was expensive (and a gift), but it's very effective, has a lot of attachments to make it easier to clean upholstery/the carpet/a computer/drawers/hardwood/the window frames/whatever, comes with a wall mount that the cable connects to so you can just put it in the mount and it charges. The one issue I had seems to be a relatively well-understood issue with the electronics, which resulted in me having to spend another $100+ on a new housing - the electronics + motor + LCD screen + etc., basically the whole 'vacuum' part of the vacuum. Given how well it's treated my so far, though, I'm not too miffed.

Our last vacuum (which we still have) was a Miele, and while it was also fantastic it was far more of a pain in the ass since it's a plug-in with a bag vs. a cordless canister. The quality is similar, I think the Dyson is a bit better, but I use it exclusively because it's far easier to go get it, vacuum up a spill, and put it back. I know that's more of a comparison between canister and bag vaccums, but the fact that they're around as effective despite the dyson being a canister is I think a point in its favor.

Whether all of their stuff is as good, or only the more expensive stuff, I can't say.

I have a Dyson SV22 v15. It was expensive and it doesn't have enough suction for carpets (we have a plug-in for that) but it's much easier to use and everyone in the house prefers it. It doesn't feel particularly high quality and it's possible I could have gotten a shark or similar for much less, but my roommate who moved in with a shark used my vacuum instead so make of that what you will. But after four years of constant use it's never needed a repair and seems to work about as well as when we got it (as long as you clear it out like any other vacuum).