I've had these for about 1.5 months now. I can attest to the quality, but I can't say that they're problem-free.
I've already replaced these once, after the internal, wire in one side of the cable came loose. There was no cosmetic difference, but one side stopped working. The sheathiing is also quite sticky, and catches on my clothes, causing strain. The wire clip doesn't work, because the cable is too thick.
Finally, the eartips are extremely difficult for me to attach. I don't know if I'm doing it wrong, or whatever, but it's downright impossible for me to use any of the eartips. I've ordered Sony Hybrids (which I think will fit, if I'm reading correctly) in hopes to alleviate this.