Depends on what you're looking for

I've had these cans for a few weeks to give them a fair trial.  To keep this short and sweet.  These are one of the best sounding portable headphones you can purchase, perhaps not the very best, but one of them.  Make sure you're comparing apples to apples.  These won't compete with Grado's or similar open headphones, but for portables, they are VERY impressive.

A few things to note:

• These do have a very lengthly break-in period before they really warm up, especially the treble.
• These are very sensitive to placement on the ear.  I find putting them a little further back on the ear sounds best.
• It will take around two weeks before they loosen up physically, they may hurt your ears at first, especially if you wear glasses.
• These are closer to reference headphones in terms of input required.  Most MP3's will sound horrible unless they are lossless---and even then it really depends on what was used to rip them to MP3 in the first place.

As long as you keep those things in mind, you'll have an incredible listening experience.  Ignore one of the above, and you'll find they're just mediocre at best.  Once you hear what they're really capable of, you'll be tossing your Bose QC'a and Sennheiser HD's in a box.