I bought a similar unit, at the Sydney boat show off this snake oil salesman.
It was an expensive waste of time, money and a danger to my otherwise genial disposition, apart from that it was a great product!
To be fair though, the one in video looks a far more robust model. Mine was all brightly coloured plastic, with flimsy nylon locking attachments.The head promptly fell off in 40 feet of water and despite assurances from the said snake oil salesman,that it floated, it promptly dived to the bottom with a speed that would have pleased the captain of a submarine in a crash dive.
I now have a $125 stick that I can attach a broom head to to clean the boat!