Kinda curious about that kind of headset myself. Using an old Sennheiser HME 45 (without ANR) that is company provided but isn't really comfortable. Was thinking about buying my own headset, either a Telex 850 ANR or this tbone thing. The latter one looks pretty good and solves several things at once but the price is a pretty strong argument against it, the telex one is basicly half the price.
So if anyone could provide some comments his experience with this tbone headset i would certainly appreciate it.