I have been using the V8 for a couple of years and have only had to give it a thorough, take it apart cleaning once. And that was just because it was starting to smell a little doggy. It would not be my only vacuum, nor the 'if you could only have one' machine, but it's darned convenient.
I've noticed 2 tech review youtube channels (review of phones, laptops, etc) have done reviews on the V10. Funny to watch those young guys pretend to be enthusiastic about a vacuum. I suppose they are being paid to do the reviews.