Just got the head phones in today. They are definitely worth every penny. They fit and sit well, when adjusted to proper fitting for the individual. I did notice a significant amount of volume change though. I would plug my iPhone 5 head phones directly into my interface. Putting head phone volume all the way up can be quite loud. I tested the AKG's with a rough mix I was working on. I found myself putting levels higher and higher. Until, I noticed that the master track was clipping significantly. I hooked up the iPhone head phones and right away, I could hear the volume difference. I am assuming that I will need a head phone amp/mixer to make levels higher but, I was totally not expecting that from these studio quality head phones. I am not sure if this issue will bug me more as time goes on and end up buying a mixer for head phones. Other than that, very good sound and quality.