I am also very happy with my BEO H9 with 4.2
As today's products are evolving very quickly, I think that the HX, which operates in 5.2, is more powerful and costs only 20 CHF more.
If I had to buy a headset today I would certainly buy a BEO HX

I have had these headphones for a long time and am very satisfied. The sound is excellent and the side noises are very well suppressed. You are also well understood when you are on the phone. I just did some research on what the Bluethooth is all about. The 4.2 standard has been around for a long time and is still used because it is completely sufficient for music and the smartphones are downward compatible with version 5.