Pros: Not as harsh as the newer 325i models. Amazing bass without overwhelming the mids and/or highs. King's X sound amazing with them...
Cons: Very slight mid-bass hump that adds a miniscule amount of mud when using the flats.
These are great headphones. They are fun sounding and prog metal particularly sounds good. Actually all rock as well. The bass is definitely there and you can feel it. The soundstage is wide for a Grado! Highs aren't as harsh as the newer 325 models. Just an all round great headphone.
Only complaint is that with flats on they can be just a smidgeon muddy sometimes, with bowls it's not a problem but you lose some bass.
They're also easy to drive.