well lets see, i used the sr-80 for about 3 years, no amp.
comfort wise the headband bends easily to fit your head perfectly, the ear pads aren't the most comfortable ever made but are fine for a few hours of listening. mine didn't fall apart, they're well built, just made of very lightweight plastics.
sound wise, it reproduces stringed instruments very well. it gives a sense of being on stage right with the guitars in a rock band. they're definately a great choice for rock music, probably the best for the price. i found the bass suitable for most types of music except electronic or hip-hop, it's just not made for that.
also they're powered very easily, 32 ohms (same as sr60), although it might sound a little better, i don't think an amp is required.