I was hesitant to buy it because I read that people complain about the fit, size, etc, but it just fits an average adult man. Weighs next to nothing and stays in place. You can still hear your surroundings quite easily through it, as I wanted. When the mic is in use, you get sidetone (which you can increase/decrease/disable) so that you can hear yourself and everything around you better. The microphone picks up a lot of voice and ambient noise, they hear me eg. easy breathing. Via bluetooth it is, as always, a combo of good headphone and bad headset, so you can't eg. listening to media quality while using the mic, which is incomprehensibly the norm for bluetooth headsets in my experience. For example, do you want gaming and chatting at the same time, you have to work with the usb dongle to have decent sound, because bluetooth just can't do it. Switching between USB/Bluetooth is easy and quite fast, so you can, for example, switch to Bluetooth to record your mobile phone while you were working on the PC. The manual is short and concise, and shows all the operating combinations. I'm no auditory expert, but the sound sounds neutrally balanced to me (so no bass boost or other abnormalities), which is always best.