For Plantronics M50:
Manufacturer usual a high wearing comfort - in Standy you do not notice after a few minutes that you have something in your ear during calls and you get the usual "perfect" voice and sound quality.
One point I have to pull off - but it is a matter of opinion - that the voice messages on Power On / Off and battery status one gets boomed from the headset into the ear are a bit annoying. As the pleasant and informative peek of its predecessors was more comfortable in my view.
The advantage of the "music enjoyment" - of course, not high quality but full enough on the A2DP protocol, this could certainly be reversed.
All around a beautiful Headset with super quality and user comfort.
(Außgenommen the voice messages)