Great review Jude. I nodded vigorously in agreement throughout, particularly every time you mentioned the word 'details.'
I have had my pair for a few weeks and am just blown away by the resolving power of these headphones. I had no idea such information was even available on a typical Redbook recording.
Another key term I think is transparency. There is a lot to subjective interpretation, but I feel these are by far the least colored headphones I have ever heard. I personally feel the LCD2s, HD800s, O2s all have distinct voices in comparison.
Somehow, this extreme resolution and transparency does not mean these cans are only useful for high end recordings of classical and acoustic music. No doubt those recording are stunning and allow the 009s to shine at their best, but almost all of the rock, funk, new wave, soul, and alternative tracks that dominate my library sound better than they ever have. I occasionally wish for a little more euphonic distortion of the signal to help out lesser recordings, but mostly I don't. And, I will be keeping my D7000s around for that. Everything else will go. These are The One for me. Woot woot!
Oh, and here is my office rig that I am using them most with:
Lossless files off a Mac: Stock PS Audio DLIII: SRM-323S: 009s
If there is improvement to be had by moving up to a better digital source or one of the high end boutique Stax amps, these babies will show it. Maybe someday I will invest in another amp; however, as it stands, the rig above is *extremely* satisfying and bests all of the very high end source/amp/phones combos I have ever tried by a significant margin. They are a bit cheaper here in Japan, but the financial hit I am taking is going to be significantly lessened as it allows me to clean out most of my dynamic gear not to mention the list of phones that I would like to try has shrunk from about a dozen to zero. The hunt is over.
To address a couple of other points...
Speakers vs. Phones?
Sure, I like speakers better but can't set up a sweet speaker rig in my office where I am able to do most of my music listening. Also, the listening experience with headphones is different and has it's own unique charms.
Improved Listening Pleasure?
I can be thoroughly engrossed watching the Matrix on a laptop, but there are some extra layers of enjoyment added by moving up to a 50" hi def plasma panel and a Bluray player. There is more to music than just a beat and catchy lyrics, the beauty of the instruments or voice and masterful producing can be a source of pleasure as well, much more so through capable transducers. Listening to different high end phones and speakers have taught me to appreciate high fidelity reproduction of music. I can enjoy less, but I am happy to have that extra layer.
Not everyone will feel this way, but no headphones have touched my ears that are as emotional engaging and analytically rewarding as these.