Using the HS-801 bluetooth headset with XV6600 (Verizon), bluetooth software build 2400, stock OEM as I purchased the phone. Reception and quality both good.
Only problem was after using headset on another phone, then back to XV6600, microphone quality was very poor. Removed profile using Bluetooth manager, re-detected and quality again very good.
No need to change drivers or anything, as this works well.