Nice headphones, you can hear well, quite good for open ear headphones! They are stable in the ear due to the "hook" they have! Sometimes it hurts from the back of the ear if you wear it for a long time, but it depends on how you wear it!

Unfortunately, the open-ear headphones are not suitable for noisy environments. If you want headphones for the gym, cycling, etc., they are inappropriate. Also, sometimes they do not sync with each other. For use at home, in the office, etc., they are convenient, connect very quickly, and appear to be of good quality

I got open ear headphones for the first time and definitely the last. I mainly use them for running on a treadmill and outdoors. I don't make calls with them so I have no opinion.
Regarding the sound, I have to mention that it is weak and when the surrounding noise is loud, it is annoying because you can barely hear the music.
Also, the sound quality is very shallow and has no sense of bass. I had never tried open ear before and I messed up. I returned them immediately.

Very good bluetooth handsfree headphones, without disconnections, clear sound, clear speech, flexible, fit well in the ear and can be used independently from each other in the pair. I have bought three different bluetooth handsfree from QCY and I think the GTR 2 is much more convenient than the GTR which is also at a price more than double.