You can use the x41s as usual for just sound as you always have. But if you combine the two you can then use the x41 to chat on PSN also
So I can use the 41's for sound on my Ps3 and use the headset to talk on?
I've seen amazon & bestbuy have the PBT on sale for ~$25. Might be a viable solution for x31/41 owners who want to be able to chat on PSN without buying a seperate headset
Taken from the Turtle Beach website
Owners of the Ear Force X41 and the Ear Force X31 can now enjoy the quality of their headsets with the PS3.
Ear Force PBT (Bluetooth Solution)
By combining the PBT with an X31 or X41, you can enjoy wireless chat on the PlayStation Network via Bluetooth, while the game audio is transmitted wirelessly via digital RF.