flood5
I performed the first part of
this modification. I think that the sound is improved. I like the 500s because they're circamural and have a lot of (admittedly unnatural) bass which I like for games and casual music listening. They also do fine without an amp.
Oh someday I'll probably pick up a pair of 580s or 600s, but that opens up the "audiophile" can of worms, that frankly, I can't afford right now.
I really love these Sony earbuds though. They need to be burned in for about 40 hours or so, but after that they sound simply amazing. Only $60
I would recommend the forums at headwize.com (actually the whole site is excellent) for those seeking good info on the wide assortment of headphones out there.
l2c