It works. I was a little skeptical because there were odd reviews for this product, but I bought it because it was cheap and it works perfectly.
One suggestion: Some reviews said their device couldn't write to it or didn't see it as having enough room. If you have this problem, try re-formatting it. I bought it for a Nintendo Switch, which hides the formatting options deep in the recesses of its settings menus, and I had to dig for them. A web search can help you find the formatting options for whatever device you're using it on.