Right after posting the previous post on this I started to mess around with it some more to see where it is useful.
It worked really well as a stand for my Kindle. Also worked with my iPad Pro, except that I had to remove it from a case for it to fit. Other than that really good for it.
The only thing that makes a bit vary of it is how slippery it is. I get why that is since you have one size groove on one side and another on the other. Still I’d have to find some anti slide stuff to put on them if I’m going to use it.