CPSC is just OK. It's a standard from the 1990s, and once codified into law, Congress now won't let CPSC change it without presenting evidence that the cost to manufacturers of changing the standard will be less than the fiscal cost of head injuries prevented. This isn't even really possible to do, so basically the CPSC standard will never be upgraded.

We now know a lot more about how brain injuries happen than we did 20 years ago. The MIPS standard is much more up to date with the research, but since the largest market for helmets does not require it, MIPS rated helmets remain rare and expensive.