These headphones I'm not happy. When I tried them for the first time, the sound was pretty dull. After the initial amazement and a little 'trial and error, I've found that they would probably provide a good sound when the loudspeaker openings would match those of my ears. Do not do it but somehow. The problem I had with headphones never before. You can rotate the plug so that the sound is ok ... but once you get moving, they slip back. At least for me. And then I have only mud on the ears.
The 2-star rating I justify the fact that I otherwise with headphones have never had a problem in that the openings do not fit. I suspect the other low-evaluations which will be complaining about the sound, also come along.
Especially, it is a pity, since this type of headphones unfortunately seem to go out of fashion and there are not many alternatives.