For me, solo pole training and MYJ have their place in development. They aren't just second choices.
In my first post I linked to a video of what I find to be more useful solo training for the pole. For solo training, I think power and accuracy should be the focus.
What they try to reproduce with this pole dummy just doesn't do it. It's best to leave that type of thing for when you have a partner who can actually hold their pole firmly and move it and/or themselves around.
Also, for the time, material, and space it would take to build this thing, or the money it would cost to buy and ship one, it's value is far less than just hanging some 2x4's from a tree.
I don't know what definition of "angle" you guys are using, but they aren't at different angles. They're at different heights. And the response is nothing like whacking a pole held firmly by a human, which makes it a useless response, imo.I see it would have its uses and the poles do give a certain amount of limited feed back being flexible and at different angle.