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As far as I know, they don't pass standard certification because of the lack of egg-shell quality. The Brock foam is supposed to be good in a multiple-impact situation, while an EPS foam helmet is designed to be a single use eggshell (it absorbs impact by cracking, then you throw it out and get a new one). I know a lot of guys that love them, so i say, run with it.
Bern did a test and found that somelike like 70% of impacts were multiple impact situation, hence why the released the Hard Hat line, I know they can't call it a helmet because its not certified.