The mic works for headsets made by Creative. The microphone may or may not work for various headsets not made by Creative. You can read the comments and reviews on amazon on which headsets work and which does not work.
Question: According to creative site, chat/voice mic will only work if your bt hdset supports aptx-ll (not regular aptx) or faststream
Answer: that is correct, make sure to buy a headset with the aptx-ll and not just aptx or the mic won't work.