However, on the plane, transportation, or simply a place with background noise (cafeteria ...), it's great. There is a light breath when active noise cancellation, but nothing annoying. The noise reduction is clear. It may very well not just plug them in and turn on the noise canceling to sleep a little more quiet. And listening to music or watching a video, it avoids having to push her thoroughly.
Great for making calls too, the microphone seems to work.
If you just want a product providing active isolation for specific situations without wanting to invest several hundred euros, it's perfect.