The sound is really good, as with all my known devices with APTX, at least as measured by the Bluetooth standard. opplung with other devices in both directions without any problems.
But what annoys massively, is much too short range. The specified 10 m are a joke. In my case the device makes with the free path between the transmitter and Empfäger even at 4-5 mSchluss.
Since the but - in addition to the price the only flaw is, I keep it. Who regularly but requires a longer range, certainly will not be happy.