Hello
I use the EC3 for a few months, I bought it because of comments dythirambiques but I am a bit disappointed for the following reasons:
What is interesting about the EC3 is its isolation: perfect for fly or subway.
By side against sound quality and balance is very average. Well below a PortaPro for acute (normal BP pro is carried up to 25 kHz for 18 against EC3) is really an entry-level stereo headphone.
That it is better than a headphone Hifi, maybe because he is better than a bad stereo headphones. He can not stand the comparison with Shenneizer HD 535 and beyond and even months with Bayer (I use a DT880 Pro, which rivals my best without electrostatic problem)

So the EC3: Good for the metro, but insufficient in the acute and hair metal in the upper midrange.

Sound quality, I would put 7 / 10 fails because the ankle has a Koss Porta Pro
Isolation, I will put 9 / 10 because it is truly remarkable.
Ergonomics, I will 7 / 10 because it was not easy for many to meet the range of sound.

Voila, it's still a good headphone for the metro