Thanks gitboy.
I haven't heard the 727, but at meet once I compared the 717 vs. the original 007t amp on the SRM007 phones, and I liked the tubed sound a lot better in comparison.
The tubes just illuminated the inner detail in a way that just sounded more real. I guess that's called bloom, but I know it when I hear it.
The same thing happened when I first had an RSA Apache solid state amp and quickly moved on to Ray's tubed B52 amp (with HD800s, T1s, LCD2s).
The 009s have their own inherent slam and tight bass, so they can deal with tubes, and the sound is not slow with the 007t/ii at all.
As you asked,
detail retrieval is excellent, imaging is also excellent, with well formed natural boundaries, sound stage is good, but not cavernous or wide or out-of-head like I think you get on more expensive amps,
but I don't miss it, for whatever that is worth. These are headphones to me, and I let headphones be headphones, not speaker imitators.
I listen to lots of popular/rock music from the 50s to modern (Kesha, Katy Perry, etc) and I love the 007t/ii for these.
The only caveat is I needed some warmish cabling to deal what I hear is a tendency to brightness in the 009s (actually, I think the 007t/ii helps with this too.)