Have used them before on the Embraer 120 - I won't get them in place of my David Clarke X11's - but they are still helluva nice headsets...
Battery life is good and the bluetooth is quite a nice function. One thing to bear in mind - they were my mates, and after a week's worth of flying about 8 sectors a day they broke - the ANR wires inside twisted off. Lightspeed dealers here did exchange them quite quickly though.