Throwing away your non-MIPS helmet and replacing it with a MIPS may be a safety-reducing decision, unless you’re buying the exact same model.
We’d benefit from more realistic models. But I guess our helmets would then cost $500.
From their test protocol (https://vtechworks.lib.vt.edu/server/api/core/bitstreams/5e7...), it looks like they simulate a fall (with a model head inside it) against a target at an oblique angle, at six different impact locations and two speeds each. They go through 4 of each helmet model for the rest.
It seems a lot better than nothing (which is what we had before them, at least outside of manufacturers own private tests). Their research was initially funded by the IIHS, the group that does the highway crash tests.
How would you like to see it improved?
Hair gives you considerable slip area making the inner rotational liners redundant or maybe even too much.
Not on a motorcycle helmet! The double D ring system forces you to cinch it tight, and it does not restrict your jaw or make it hard to talk.
If you are experiencing this your helmet may be the wrong size. Most riders are picking helmets that are far too large.
The days of having to shell out $600 for an Arai or Shoei for superior protection are past us.