I can't get sidetone to work. I suspect that is just operator error though. I have had issues with the microphone intermittently working. Sometimes it would cut out completely, other times it would make me sound like I was underwater, or turned into a robot.
My first SteelSeries purchase, and one I'm very happy with; I wasn't sure about how well 7.1 headsets would work; This one erased those worries; In games like ARMA 3, I could easily hear the faintest of sounds and discern what direction it came from.
Wish the cord was a little bit longer; No eggs off for that though