I think both the Easy and the Maytag of the other two videos were meant to run with more speed..... speed is really too slow to provide a good agitation IMO.... I find particularly good the idea of the weel counterweight in the Easy to give inertia force and a more fluid power...
I confess that if they really were on sale and I had enough space I'd buy one.....
I like the idea of doing my gym and at the same time doing laundry with my energy it gives a purpose more to my efforts, in winter months when go out for a ride in the countryside or for a run is impossible having it a home would really be nice ... without counting that it would be a nice idea for undeveloped countries not having electricity as it was said.