OnGuard was careful to keep the cost high enough that it will not be a true competitor, too. (at least for the LiteLok X1, which are $150-200)
I'm convinced, re. angle grinder resistance, but there are other tests too. Sledgehammer after freezing liquid, crowbar, etc. My thinking is that if it's hard enough to completely reject an angle grinder cutoff wheel like that, it might be super-brittle in other ways...
This is a good overall video, but I don't agree with him on the helmet. It's very expensive and the earholes are stupid. A downhill MTB helmet starts around $125, but this one looks a bit more urban chic, I guess.