These plus a good USB-DAC (like those based around NwAvGuy's ObjectiveAmp) will make your listening experience much nicer.
I returned them and grabbed the V-MODA CrossFade LP. Its bass response is heavier than even the ATH-M50s, and a much better high frequency response. Their only downside is a dip in the middle frequencies. It gives them that club sound (DJs general dip the mids in clubs, as it makes it easier for people to hear one another). I like it for most of my music, but they definitely suck the life out of classical music and other similar, balanced sounds.
I'll probably grab pair of open Sennheisers to compliment my V-MODA. I'm hesitant only because Sennheiser, despite the HD-280 Pro being built like a tank, they've burned me multiple times now on shoddily constructed portable headphones.
How do audiophiles get a chance to do this? I've never seen a "headphone store" on a street corner.
(source: I was an audio engineer in a previous life. I also own 3 pairs)