Worth the asking price to you?
Caveat: The Abyss I'm auditioning is modded so I'm unsure how the stock Abyss compares. They also have custom Marvey cables that have 25% more awesome than stock cabling.
Listening a little tonight with X-Sabre > 2A3 MKIV > Abyss with some of my own music. I agree with Marvey's assessment that this sounds much closer to a decent speaker setup than other headphones. I definitely prefer the HD800 on some music, but live and older recordings just sound much closer to real live music.
Subjectively, if I just had this single setup with the HD800s, I'd get the Abyss, too. The bass is to die for and it just does a lot right tonally. The speed is amazing (as many people mentioned). I agree the price is pretty high, but I really do like these quite a bit.
I've owned and sold the TH900, SR-007 MK1, and LCD-3 and I've spent quite a bit of time with the SR-009s. If I was in the market for a second flagship to complement the HD800s, I'd get these. As it is, after I move if it turns out my dreams of a new speaker rig aren't possible, I'll most likely pick up a pair.