AKG K550 - a clear reference headphones!

Since I'm not a fan of long reviews, here's a summary:
1. Processing and Design:
Top - nothing to be desired
2. comfort:
even after hours of enjoyable
3. sound:
totally balanced sound like pure studio monitor,
Sony MP3 Player + PracticalDevices XM5 headphone amplifier immense headroom, powerful sound and plenty of reserves in the volume,
Environmental noise (mainly underground) is negligible,
have sound-heard details that I've never seen
4.Conclusion:
needs no comparison with other headphones to fear; not even with the more than twice as expensive Denon D5000 (who's interested see website of Inner Fidelity)
Strong buy recommendation !!
PS: Think about me a 2nd only for home buying ...

Update 20-12-2012
Have a 2nd ordered only for home !!