I can't really watch the video while in class, but I can say that I saw one of these a few years ago at an airport store, being super bored with my five hour wait I decided to try it out and found it super boring. Maybe I wasn't doing it right, but it didn't really feel like riding and I found it to not feel like much of a work out.
On second thought...It might be good to teach people how to ride before burdening a poor horse with unbalanced hands and strong legs! Lol
It might also be able to teach people (i.e. ME) how to gallop - without all the, you know - risk of falling off and killing myself!