Does anyone actually use those USB air ionizers?

Anyone here used one of those USB ionizers—specifically the IONcare ones? Interested in your take on them.

Has anyone actually picked one up? Does it actually do what the ads claim?
If I grab one, how can I tell if it’s even working properly? Besides just seeing an LED light blink, is there any real way to test it?

Is nobody even touching this thing?

Looks like I posted this in the wrong sub.
Mod, can you move this thread to the right section? 🙂