Dyson = over-rated plastic junk. We have four of them in the house, and only one (the oldest model) works 100%.
I've reviewed 3 of the more recent models for Best Buy in as many years and we originally owned one prior to that - so 4 in total for us as well.
(5 including the corded one...)
We never had a problem with any of them. Certainly the oldest, the one we purchased, is less powerful (suction & run-time) but for the past 3 years they've really upped their game and the V11 we use the most is a total beast. The battery lasts more than a half hour on Max setting and that's longer than it takes to 'run' through the entire house. In Auto mode is can run for more than 60 minutes.
For a stick vac mind you, they produce a lot of suction and their battery run-time remains solid for years - unlike Shark, Hoover, etc etc...
And prior to the cordless revolution Dyson made beast uprights.
Are they expensive? Well, discounts notwithstanding - yeah. Their 4 hundred dollar hair dryer was a real L O L ! But their designs aren't junk.