Summary: As someone who listens to music while commuting every single day, these headphones are great when you all you want to hear is YOUR MUSIC rather than outside noises. The bass is not too heavy, the treble is clean; these headphones simply sound great. Unfortunately I'm not a fan of the design, but that's really a minor issue anyone can get over.
Summary: The sound of the Sennheiser PX-200-II is quite different from the sound of the PX-100-II, and where I would normally expect a closed earcup (PX-200-II) to produce better bass than an open earcup (PX-100-II), the opposite is true with these two headphones. Bass with the PX-200-II is down about 5 to 6 db overall compared to the PX-100-II, but is up about 3 to 4 db compared to the Beyer DT-48E version 2010, which is known for very light bass response.
Summary: I know I marked both comfortable AND uncomfortable... let me explain. I got theses as a birthday present for my wife. She really likes them and says they feel comfortable (as long as she's not wearing her big sunglasses). When I tried them I found that after a song or two they seemed to put a little too much pressure on my ears/temples no matter how I adjusted them. It wasn't painful, but not comfy.