There is a high probability these will not perform adequately on at least a quarter of users simply because they rely on a fit-all multi-flange plug as the passive seal. Very oval, tortuous (twisty) or small canals do not suit this type of plug. Good electronic processing is useless if the passive seal in the canal is sus. I'd also have concerns about how secure they are in anchorage- minimal flange grip and somewhat proud fit is not a good recipe.
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