The first impression is that they are very good. Fits well around the ears, you do not think much about them.
The sound is really really powerful and in a PC very configurable with downloadable software.
What makes me choose them instead of type steel series or hyperX are two things.
1. I only have very good experiences with JBL, everything from music equipment to small shower speakers.
2. They can connect Bluetooth to the mobile.
Many "gaming headphones" run dongles with radio frequency, and can not be connected to phones and the like.
Will update a bit after I tested them in long video calls and the like.
But right now: BUY!
EDIT after 3 weeks: Battery life is really good, no problem to sit a whole night. I think I got to 8h a couple of times without any problems. If you just turn off RGB, there are no problems.
I have also been told that the mic sounds really good, and the quick mute works flawlessly.
The sound is still great, but the only negative I can say is that they feel a little in the ears after VERY LONG sessions.