My, My - this always gets a bit 'heated'
NK - the less said about your video's the better - but really, you need to show say 3 meters done with hot compared to 3 meters with cold - because quite crudely 'your pace' is not going to be the same as others - so please make it a like for like
I am of a mind that yes, Hot makes a difference - but not THAT much of a difference - certainly I would not be making more buy paying out 4.5K JUST to get hot
I mentioned placebo - because quite frankly if you buy a new brush you have find yourself cleaning quicker and this hey! this is the best thing since sliced bread, when its really just a change that makes you clean quicker..
I give you the case study of the factory where the light bulbs were changed for brighter ones - instantly the production rate increased - people were happier at work - all was good - six months later the production had slowed down - the light bulbs changed again this time to the original dimmer bulbs - guess what production increased !
Darran