I use it for one month I found a small shop in Hi-Fi the seller did not have to convince me a long time. The sound is clear, defined, I find the correct spacialisation. Before I also had Sennheiser, the 500 then 570. In both models are too low this there is a lack of definition. This is a really good headphone over there is very little difference with the model just above the 600, it is the aesthetical, the small speaker are the same. I choose to do it again no problem. But I never listened to anything other than Sennheiser. I think I can use this headphone to correct the mix right now but I have to buy a good sound card that is up to my headphone.