Some of the problems I had with my Dysons were
The attachments used to fall off
The turbo brush stopped spinning on rugs etc or if hair got caught in them
The plug came out of the socket too easily so often, I would be hoovering the stairs and it would switch off.
The tube wasn't strong enough and used to flatten, blocking off air flow.
It was always chipping paint
I hated emptying it.
I have to admit, the first one I had was great. Really heavy & solid. It was a DC1 - made in the UK. (They are made in the far east now) I stupidly decided to "upgrade" and after 2 more, I gave up on them. The Miele is nice solid German engineering and quality materials for about the same price as Dyson.