Review (4/5): It works
I would give 3.5 but not 3. so its a 4.
It works as advertised. It has a couple of problems, one I have fixed, one that doesn't matter that much, and one I don't think I can fix and is a significant problem. Hopefully, someone will tell me in a comment how to fix it.
1) the foam is itchy. I fixed this with no issue by cutting a piece of mole skin to put between the foam and my face.
2) the plastic lens results in mildly blurry vision, which makes it hard, but not impossible, to read. I am hoping someone will come along with a solution for this. Like, say, something I can rub on it.
3) the string is a bit uncomfortable, but only a bit. Eventually I'll put something more comfortable in its place.
Overall, worth it. Cutting the mole skin was a bit fidgety but not that big a deal.