Summary: EDIT: After trying more TOTL headphones and electrostats, I bumped the rating down.
Please keep in mind I'm reviewing them for the purpose they were created. Beyerdynamic targeted them at mobile users who are looking for high end portable cans. I spend 2-3 hours on the go every day and the transit here is very loud so I need something that isolates. I also can't really be using semi-open or open backed cans in the library where I'll be distracting people.
Pros: Accurate. Not Grainy. Very good dynamic range.
Summary: I mostly agree with the avguide review http://www.avguide.com/review/beyerdynamic-t5p-headphones-playback-38 read that review, since it actually describes the sound very well and seems in general pretty honest.
T5p have terrific comfort to isolation ratio of all the closed HP I've tried (good enough to barely hear yourself type on quiet passages of classical music, but no pressure related problems).
Pros: Comfortable,?Easy to drive?,nice build (both drivers and HP), leather earpads and headband, good isolation and soundstage?,felt carry case and ext.cbl
Cons: 'r-shaped' ssig or EQing the bass to get a 'lush' sound if desired is not for everyone. Cable not removable...Diffused soundstage/high THD in the mids