You will need to communicate with other Xbox live users if you play games on line.
Such as to get tactical on the likes of Co-op gears of War or to rip enemies and other players you beat.
The headset itself fits tight on your head and doesn't fall off. The In ear volume of other players is adjustable and if you don't want to be heard you can mute your voice through flicking the swith where the headset attaches to your controller.
Wearing it for long periods is also not a problem as the ear piece foam is very comfortable.
Essential if you had the Core system and are going live.