Well mastered 320 kbps Mp3 and 24-bit Flac files sound amazing. Blu-ray movies sound better than the speaker setup at public movie theaters minus the sound impact to the whole body.
Flat eq sound that's hard to find in today's headphones; Very reliable and still sounds superb; Easy to drive and gives high volume without amplification; Sounds phenomenal with Blu-ray + Dolby audio post processing
Still requires a decent headphone amplifier to hear that awesome tight bass at lowest frequencies; Some poorly mastered CDs and MP3 at 128 kbps sounds ugly with the instruments mashing up during chorus which is clearly caused by compression