I looked at those too. Apparently they don't have enough foam sound deadening material and the 31nrr is VERY optimistic according to a few reviews I've read. Also the multi mic setup doesn't really give you a true surround sound effect.
Looked at reviews on the Peltor 7S and a few others that I can't afford. I had the Radians Maximus 4-channels for a while until they crapped out, but it had true stereo as I could pick out sounds behind me or to the side. NRR was similar to my Howard Leight muffs. Hopefully they improved since mine was made.
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