Imitation is nothing new.
There are imitations, duplicates, even fakes.
Most of uscan spot a fake from miles away.
Yrs ago, how many Hoovers were copied? Eurekas? Lux? Plenty.
I never owned a Dyson, so, I cannot speak much about them. I'd certainly not bash.
I've had to run other makes, over the years... some, of course better than others.
Never had a Shark. I know some, evenworked w/ some. To me, they belonged in the ocean.
I'm NOT bashing Shark vacs. just to be clear.