This is the first time I've been moved to write a review of any product that I've bought online (and I buy online very regularly).
Having spent 20 minutes cutting the headphones out of their thick plastic casing, using a stanley knife and two pairs of scissors, and depositing the huge case in the non-recycling bin, I set about getting the all-important "fit" right for my ears.
I found the set of ear plugs that fit me best and ensured they were totally in my ear canals. I pressed play on my ipod and the sound quality came through crystal clear. However, I was extremely unimpressed about the bass. There is NONE at all. Not even in the same league as very cheap headphones. I tried turning up the bass on the Ipod's EQ, but even on a lossless-encoded track, the quality declined heavily.
I tried other ear buds, just incase the lack of bass was caused by the fit, but could not get any improvement at all.
These are supposedly "professional" headphones, yet they sound worse than the ones that come with the Ipod!. I cannot stress this enough - AVOID at all costs.