The connection to the iPhone was straightforward and runs without any problems. The sound quality is good both for me and for my interlocutors. The navigation via iPhone is well understood and has no interruptions.
Whether the device also listen to music suitable I can not beuurteilen lack of practical experience.
For anyone looking for a headset for making calls, that even at high speed with an older motor vehicle has a good sound quality for both parties, I can issue a buy recommendation.