We have a dyson V6 and we love it with one issue, the filter.
Do NOT wash it. Hoover it with you big hoover and/or take it outside and give it a bashing.
If you wash it, it will smell awful as not all the water will dry quickly and where it doesn't, whatever is mixed with it will rot and stink.
I spoke at length with Dyson about this and they were without doubt as useful as a chocolate teapot and defended their product and told me to buy another filter.
Here endith...
ps, buy one with the small head designed for picking up hairs. This one you'll use for the stairs,,