These headphones are awesome. They truly are. I did happen to have some bad experiences with them, but my pair was defective (most likely). It happened that a piece of plastic snapped in half and a screw inside broke, leaving the right earcup hanging. That said, the guys at the Hi-Fi shop took the headphones in to see if they were fixable. Turns out, that was not the case, so they gave me a new pair of headphones. These are great. Just wearing these is amazing, due to the self adjusting headband which provides the most comfortable fit. Another nice thing is that the headband is not too light, it provides some resistance, which is nice. The lack of resistance is a problem that i have experienced with the Audio Technica audiophile headphones, which have a wing mechanism similiar to AKG's. Those headphones just feel like they are a feather on your head, but the AKG do feel solid. They feel like they're there, and to me that's a nice feeling. It feels secure. There's no point in having a headphone so light it feels like it's not there, when it's gonna slip off in a second.
Talking about the audio quality, i have to apologize for not knowing much about the technical terms. The way i would describe these is "lush", as in, the sound is very balanced and it feels silky smooth. It is by no means an audiophile grade headphone, but that's not what it's supposed to be. AKG never really delved into the audiophile side of headphones, and that's not necessarily a bad thing. Having a "lush" headphone does not mean it's accurate, but fun and easy to listen to. It's kinda like a break from the very cold and emotionless headphones that are known as audiophile headphones. If i had to give a "natural" comparison, audiophile headphones are to 'Ice' as the AKG K 272 are to 'Water'. The audio is not as cold, but not teeny. The actual balancing is really good. The trebles are very present but not overwhelming in any way, they also don't peek like some tend to do (primarily the Skullcandy headphones, which are not worth talking about). The mids and vocals are clearly the best part about these headphones. The voices are sharp, and very defined. It literally feels like you're wearing two headphones. One for the instruments, one for the vocals. And they don't overshadow the rest of the audio either. The vocals are right were they should be.
If anything, the only thing to complain about when it comes to the sound is the bass, as i found it to be a little lacking in some situations, but still there, and good sounding. It's something that's not hard to get over anyway. It's easily dealt with.
I used to have bad impressions about these headphones, but scratch that. If you're gonna ponder on whether or not to buy these headphones, don't bother. I'd easily buy them blindfold.
Highly recommended.