Twice the run time and half the power.
And what about the battery capacity of each?
Vax Blade has a 150 watt motor while Dyson V6 has a 300 watt motor. So he is right, Vax Blade is crap.
I ordered a refurbished V7 pro from the Dyson eBay store for £161 (with the recent 10% off code) and a shrink-wrapped, brand new one arrived this morning - including the 2yr warranty. Still only £179 on their store, so could be worth a punt if you want a bit more power and battery life! Doesn't have the extra bits this one does though.
Ordered one, seems like a good deal. Nearly went for the V8 but the cheapskate in me took over.