I already knew the Sennheiser brand for its quality, and I hesitated on choosing among their models, many, or it is sometimes difficult to find the differences vis a vis prices. The PC131 just blew me away by the quality of its open headphones that made me rediscover certain securities. Excellent high or low without saturation. The micro looks excellent too, and do not take the parasites ambient sounds. The helmet itself looks solid, it is légé and is forgotten very quickly on the head. The headphones have a small joint that place perfectly on the ear without pressing. The microphone rotates 360 degrees allowing to place the right or left side of the mouth. The only small defect found (but not for me) is that the helmet is, by its arch, rather reserved for people with a big head, otherwise it may fall if nods. This is a great headset for gamers, or tchaters. I recommend it. There are more than to see for the life ...