Comfort:
After prolonged wear (> 2 hrs.), Press the headset a bit.
Function:
The Bluetooth connection has easily work immediately. And the function keys work as expected.
Both the computer and on the iPhone and iPad.
If the battery is empty, can hear with the included jack cable to the socket on.
The speakers are very good for the price and get a good bass. The microphone is only worthwhile in quiet rooms. Once some ambient sounds are, the other side does not understand, and it ends in a scream.
So if you can do without the micro is very well served at this price.