Just listened to this can compared with the hp1 at a headphone meet on a balanced gilmore reference headphone amp (solid state, expensive, built like 2 tanks.) Off the balanced gilmore, the 225's had tons of bass and sheer aggression. The sound was in your face attack. Your head was just filled with the sheer size and sound of the music. Not much of a soundstage to speak of, but that's what they say about most grados. Some people prefer it that way. Unfortunately, I didn't get to try it with any of the tube amps, but if that's what you're looking for, grab it! It's a really fantastic price for the headphones.
(I preferred the hp1's but, they do cost significantly more :p They sounded almost nothing alike, btw.)