When unpacking the product, I had some fears about the comfort seeing small growths on the hoops ... but to use it is not so! Lightweight and comfortable, if you choose well caps (different sizes are supplied), it is perfectly forget.
Another pleasant surprise: the sound quality. As for comfort, where I expect a minimum service, I discovered a more than acceptable quality in terms of price. It is not rendering a Bose or Sennheiser other that are in another price range, but there is nothing obvious fault it.
I did not go to test it under water, because I believe that the "watertight" mention is a translation error, but I have been obliged to subject it to rain and perspiration, which seem to have had any impact.
So it is a helmet that, in my opinion, keeps its promises and offers an excellent price / quality ratio.