My first thought was it couldn't/wouldn't produce a clear sound using the helmet as an amplifier. .............The lining has to have an effect on the sound quality.........didn't make sense to me.
looked for reviews and came up with a lot of negatives and some positives.........
The odd thing is, (slight of hand), on the Domio site they have had 748 reviews. looking at the reviews posted they have a 4.7 rating out of 5.............pretty bloody good........... until you look at the figures................. that 4.7 is based on 402 reviews out of the 748, where are the other 346 reviews and why haven't they been included in the out of 5 rating......That combined with the other negatives i found i think this product is just plain snake oil.........Very SUS