I sent my W60 off, to one of their authorised UK retailers, 2 weeks ago and I'm still waiting to hear whether I will be sent replacements, as they have to verify that they are broken. I've explained, over the phone and in writing, that they are alright most of the time, but in a 2 hour listening session the sound from the right earphone might cut out for a fraction of a second 3 - 6 times ... it's not like they can just stick them in their ears and go "oh yeah, they're broken" straight away.
I agree with the comments about them sounding incredibly, and they are also extremely comfortable, but as far as I'm concerned Westone have completely killed their reputation by producing various earphones with such regular build quality issues. It frankly pisses me off that they know that these issues exist but they keep pushing the same un-fixed products out into the market.
I already tried the Shure SE846, but didn't like the sound signature, but I'm no longer a Westone fan boy and I'm looking for an alternative universal IEM that gives me the same sound quality and comfort but with better build quality and a longer life span.