First and foremost, I guess it's all about the zipper. I do not carry a handbag with me, so anything that helps reduce volume is welcome. In the case of earbuds, I always just roll them around my iPod, but of course, with time, normal earbuds acquire a nasty behaviour of tangling themselves, and it comes to a point where it doesn't matter anymore how many times you try to straighten them, they will insist on tangling. With these earbuds, that just can't happen! Firstly because the zipper stops the "double-cable section" from tangling, period; but also, because the part that is not zipper, neither is a normal cable, it's like some kind of braid that, in my opinion, looks more durable than normal plastic covering, and also more flexible. Also, they are in-ear, which, in my opinion, offer always a better sound quality than the rest (unless you can pay like over 150 euros for some high-quality brand headphones, of course).
But of course, as of the moment where I'm submitting this review, I've only been using them (daily, while I commute to and from college) for about a couple months.