We had one of the V1 (or maybe V2?) vacuums and it had some obvious design floors: e.g. the exhaust blew forward out of the front, so if you were trying to suck up some fluff, the exhaust blew it away from the vacuum! You had to reverse over it to get it - madness!

I remember ranting about it whenever they were held up as masters of industrial design etc - clearly people saying that did not have one :)

I've not used any since, so don't know if they are any better these days or not.