Cordless
I'm not convinced at all.
The V10 run times are spin-doctored (as usual). Real-world use reveals a much lesser run time.
Batteries can and do wear out. Dyson should have offered the option of swap-over batteries.
Trigger-action switches are no good for arthritic hands. A rocker switch would have been better - but a rocker switch can be left 'on' and thus reveal the true battery life of the machine, i.e. not long at all.
And then there's the design... Uprights can be locked in the upright position whilst you alter the furniture, answer the door, etc. This thing has to be propped up against something, or laid flat on some surface. Woolly thinking on Dyson's part.
If this new super-duper motor is oh-so-wonderful, why the bloody hell can't they stick it in a super-lightweight, corded upright machine, which doesn't fall over?
Finally, the price... £400 - £500? Pffft! No chance!