Well I haven't tried the zen, so I can't comment. However looking at pictures, I would surmise that the zen's are built a lot more sturdier and will probably hold up better than the ep630's. Also, some people don't like the slightly boomier or some say muddy? bass on them. I find they're perfect for something like gym use, where you want to enjoy the music, and not sit there and critically listen to every nuance in the song.
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