Negative: The microphone is actually quite "trivial" and what it will deliver good performance, I was expecting more for this price. Note that I have not succeeded in removing a whistling sound when it is active in the launch of a video or a music or during conversation.
Positive: After the sound side it is really good, very good record ..! I rediscover my music and it's a pleasure. As for the 7.1 is a little bit unnecessary since most of the sources are at most 5.1 but it is still beneficial in certain situations. Comfort is also present, I really enjoy spend several hours playing or listening to music without feeling any discomfort despite a fairly "big" head (helmet adjustment is also very precise).
Overall I recommend this very good bill that breathes, one may say, the strength!