I use the three weeks since E3 soon, and it's a real treat! The "little lack of bass" spoken of many reviews, is corrected by pressing the headset far enough, so trying several tips. Level of sound clarity, even if it does not match my Sony MDR 7505, I find it ... amazing! Of course, it's simple transducer, but I think it's very accurate, notament in the medium. It's better in any case that most Walkman-type headphones.
I feel very comfortable because the E3 light, and once properly installed, with the nozzle is best for everyone, it fits comfortably in place (small suggestion for those who lose their ear: when you put them, pull the flag of your ear up, and put the mouth wide open, because the ear tends to deform a bit when opening the mouth, and it just move the headset ... yes, I know, it was look stupid a few seconds ...)
Given its price (relatively low), and knowing that I do not have the means for the upscale Weston, earsonics or ultimate-ears, I think the E3 is a very good acquisition.