We have gained the headphones in order to listen to music in the ordinary way or to watch TV without disturbing others in the household. The sound quality is fully present everywhere in our apartment, even with closed doors and without major irregularities. But think you should be aware that it is for the price to no professional equipment. The use of mobile phones does not interfere with us the sound.
The comfort is pleasant. The headphones are now for 4 weeks in operation. However, the longest wearing period was about 2 hours before, what seemed uncomfortable at any time. The fact that no annoying cables are available, I did not want to miss. The headphones are indeed made of plastic, however, came with me so far no negative quality perception on. The build quality is as good as expected and ultimately plastic simply very easily and therefore good for the comfort.
The connection of the headphones is easy and requires no judgment.
Overall, it's a great wireless headphones at a fair price. A buyer may indeed expect no professional equipment, but certainly an absolutely suitable for everyday use headphones with high comfort.