The optics are dfinitiv class, I'm already several times been asked about it. The sound is Kwie of some already mentioned not high end, but I find it absolutely fine so not a cheap clatter or so at the sound.
I use the headset alternately with my instruments and also the pairing is quick and effortless.
The disconnections described by some I can confirm nciht. Whether left in your pocket, on the right or on the inside or even from across the room with me no problem. No crashes or hook the sound.
The seat of the headphone is pleasantly laid on the head, and not slip down while jogging. I have a rather small head (which was a problem in many Ironing headphones), but here fits the smallest setting with no problems.
From the "just in sports" is by the great Dng quickly an everyday device gewordenwas even with. brush in the apartment or in shopping is taken.
A strong buy recommendation from me