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I've read those complaints about the Etymotic's sound before, but from what I've read the concesus seems to be that they are more comfortable then Shure's.
I've never used either, but I know my dad replaced his e2c's with ER-6's due to the e2c's not being comfortable and he is really happy with the swap.
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FWIW I mostly use the foam ear pieces rather than the rubber flanged ones and I think they're very comfortable. I have often worn them for up to 5 or 6 hours at a time. I haven't tried the shures.
