Volume -
is not overwhelming, but close enough to the ears maximum technically meaningful.
Mechanics -
makes a very solid impression. An earlier pair in the family operated for 6 months without any complaint. The ear seal, a very individual matter, works for me as good as the previous "Koss - The Plug", but without the cumbersome Gefuddel.
Sound -
why I love this fortuitous: Clear, clear, without übetriebenes Gewumse or hissing. As you can hear with pleasure Anna Netrebko or Culcha Candela: clarity and sufficient power in one.
No cons?
But, therefore only 4 stars: The cable leads in this fortuitous to a significant stethoscope effect, ie movement noises are well transferred. Anyone who is looking for a fortuitous for the sport, should rather take up Spezialhöhrern Sports area with softer cables. I use these things at home or on the train, here the effect does not interfere.
Overall: As written above, balanced sound for (very) low price, a clear recommendation.