The $7.27 twist board
(includes shipping) (also called a "wobble board", according to the instructions) I ordered has come, and I think I like it, better than the 3 skate spinners I have previously tried, all of which cost more.
(I have previously tried "Gold Medal" brand spinners, one that looks like this
, one that looks like this
, and one from Rainbo, that looks like this
In particular, because it is 10" is diameter, larger than the diameter of the little spinners I have previously tried, and it has a lot of horizontal stability, it is easier to put my foot on it in a way that I don't immediately go flying off. Basically, the improved stability slows down the loss of balance to be within my reaction speeds. I suppose each of spinners I've tried has their advantages. Maybe it is my relatively poor sense of balance and slow reflexes that makes the recent one seem best... In fact, if I could find an even bigger and more stable one - say 12" - 15" in diameter, I might like it even better.
It is still going to take me a while to make it work well. I can only stay balanced on it if I go very slow. But, I always make slow progress in athletic things.
There is no brand name on it.
I don't happen to believe that the "reflexology magnets" built into the board affect anything, but that wasn't why I ordered it. If I put the side with the pictures of two feet up, I can feel the little upraised portions on my (bare) foot, so I can feel that I have placed it where I want.
You can also place two feet on it, and practice "the twist" - useless for skating, but it is exercise.
I tried some small jumps off of it, but am not far enough along to evaluate it's use for that.