I'm tempted to give it a shot. So right now, it's the TBI Millenia or this. I'd really like to try both before I buy, but that might not be doable unless I go to a head fi meet.
Trust me, the way I am OCD about this stuff, I have a feeling even after I get something endgame-ish (LCD3/X/HE6 + amp), I'd still be around head fi looking at Stax and other higher end stuff that I'd be drooling over. It's a sickness, the gear obsession. I'm crossing my fingers that after this, I'll be content for awhile at least which I'm confident I can be.
It's rumoured that an HE-6 successor might be released next year.
I can definitely say the HE-6 with a quality amp is close to the SR-009 in performance.