Other than that, I have tried numerous headsets and none have been reliable. Even BT keyboard (other than Apple's) have been spotty with the MBP as well as phones and tablets. USB tethering works far better than BT tethering. None of the SmartHome devices have worked with BT-low-power, etc.
I think that BT using the 2.4GHz ISM band along with WiFi, microwave ovens and some ad-hoc RF devices is just too much congestion where the strongest signals swamp battery powered attempts by BT devices to compete.