Mostly because a boss has the 645, likes it, and it seemed to fit everything I was looking for. (Super comfortable, very good audio quality, very secure.) Downsides so far: I'm still having problems voice dialing from it, and the optional earloop needs to positioned just right or it pinches over time. I'm really surprised at how firmly it stays in even without the earloop, though -- it's just doesn't have enough mass or lever moment to jostle itself out.
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