Does look very slow on the vid.
I use a pole and attachment and clear 6 foot at a time I insure for this as we do quite a bit also fixing. Anyone that clears gutters check with your insurance policy as this has to be added

I am guessing the vid was just to show how it works and not or the speed side of things

good on you for taking the time to make vid and add it.
I cant knock the safety side of it and would look great in a customers eye and would command a higher price.