We have not "graduated" to a cordless yet, although Mrs
@BoldonLad is dropping heavy hints.
We are on our second (Mains) Dyson (in about 25 years). Mrs
@BoldonLad, cleans the filters periodically, as per the instructions, and they work just fine.
I usually have a few "spare" Vacuums in the garage (some Dyson, but, not exclusively), which I "recycle" to the offspring, when their Vacuum is "broken".
It goes like this: Periodically (ie about once a year) they declare their Vacuum Cleaner has packed in, and they need to buy a new one. I give them one of those I have in the garage, take the broken one, remove the hair and debris from the brushes, clean the filter, and put it in the "spare" rack, ready for the next "broken" vacuum.
I did once ask the eldest offspring if she ever cleaned the filter on her vacuum(s). "what filter" was her reply. I decided it was easier just to do it myself. As they periodically tell me "that's what Dad's are for"