From what I've observed so far they have improved just about every aspect on the V8 from the V6. I've given it a wiz around the house and it has picked up loads.
My only criticism is that they have shortened the flexible hose that comes in the extra tool kit.
When you compare the picture of the hose I had for the V6 to the hose with the V8 it is about two thirds shorter!!
This I feel is a little bit naughty of Mr Dyson penny pinching on something so trivial given the high cost of these machines.
I bought the extra tool kit mainly for the flexible hose and stubborn dirt brush as these are vital parts that make this machine perfect for car cleaning.
I've tested it out and the new shorter V8 hose is still long enough for my needs...just. I can still clean the footwell in the car with it, under the seats and behind the pedals in the divers footwell... But the longer hose for the V6 was much nicer in use.
Pics of V6 and V8 setups for hose comparison....
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