Also your friend in the video relates to the filter differences on the Hoover Windtunnel Air and compares it to the Cordless Air - however he has got it wrong - the HEPA filter in the mains version is located above the main shroud at the top of the vacuum - not above the motor at the bottom of the mains vacuum.
It is not his fault entirely that he feels disappointed by the Cordless Air - it is down to both Hoover and Vax's claims that it is a full size upright that can do a large surface area - and thus falsely puts into the minds of its buyers that it can do the same job as a corded upright vacuum with a hose on it.