Pros: Very good detail, very balanced sound, good soundstage, good comfort, somehow elegant, robust build.
Cons: Dramatically lacking bass, no personality, no EQ response, poor portability, pricy.
The other reviewer said enough and in detail, so I will limit myself in giving my very brief opinion of their sound.
Later on in the Forum, in the "Huge Comparison" thread, I will make a sort of comparison with all the many BT Headphones I have tested, including the AKG.
It may be because of this comparison, and it may be because I think that the typical neutral sound of the AKG is good only for monitoring/making music rather than for listening to it, but, I was not impressed by these headphones. They lack personality, they lack soul, they are unemotional.
They are not as terribly cold as the Sennheiser M400x, but still in that direction.
It is absolutely true that they have a very good detail and soundstage and a balanced sound, but, the Plantronics Backbeat Pro have them too, plus much more. And the Samsung Level Over also, even if then they are disappointing in other things.
I would put the AKG in third place.
They perform quite similar to the Samsung, the both dramatically lacking bass, with 3 main differences:
1) the Samsung are warmer, tend to prefer the mids. The AKG prefer the highs.
2) the Samsung respond much better to the EQ. With the AKG there is almost no difference.
3) the Samsung have more personality.
The Plantronics are for me on first place. They are still well balanced, have very good detail and soundstage, excellent highs, good mids, and also good bass (good in quality, moderate in quantity, with good response to EQ -better than Samsung- for if you want more).
In the AKG and in the Samsung the bass is just symbolic. You can hear it but you can't "feel" it. It is like reading a recipe when you are hungry. It does not work as well as eating.
Overall I have found the AKG not interesting and not versatile. I cannot imagine myself using them, WANTING to use THEM, for many different kind of music.
They would probably be wonderful for Classical Music, and good enough for Folk, Pop, Chill Out (even if for Folk and Pop I would rather use the Samsung which are warmer).
They would never possibly satisfy me when I want to ear something more energetic. They completely lack punch, warmth, personality, and emotion.
They are not exciting. I may sound hard, but they are boring to me. Like the Sennheiser.