Got it in 3 weeks as in 3 weeks ago?
How long did you listen for?
I read in numerous places they needed a fairly long (50 hours or so) burn in to warm up.
No opinion so far. I've barely used mine enough to decide. Remember they are a less balanced headphone then the M50 in exchange for better bass. The M50 are probably without a question more of an "all around" headphone then the COP's are.