They're still mostly vapor-ware in the US.

I think POC is still the only vendor who actually sells one in stores. I don't know if its because they haven't taken off, or what. It seems like there's no manufacturer interest in safer helmets period. I'm surprised a how little innovation is occurring with helmet safety.

There are legitimate questions about the effectiveness of MIPS in real-world scenarios. At the same time, I'm not seeing any manufacturers with any new designs to limit concussions, so its basically the only option if you want a better helmet.