I just got a pair of these from the seller and here's what i have to say.

I have to mention beforehand that I have never heard how an EP-630 sounds like, so I can't compare these to one that you can buy off the shelf. Keep in mind that I have been listening to speaker setups all my life, I can't even remember when was the last time I put anything besides cotton buds into my ears.

From the build quality, I strongly believe that these are originals. The "A" logo looks like high quality printing, the cables have a soft rubbery feeling to it, and it splits nicely at the Y joint.

Soundwise, they sounded great. Adequate bass, decent mid, treble is there without being too sharp, and instruments are staged quite well as well. In short, they are not muddy sounding with thin, sharp treble that kills your ears those you hear with cheap phones. It's well worth the price paid.