I own a pair of the CD2000. It's OK, but not as good as some other headphones that sell for the same (street) price as the CD2000. It's supa-comfy, however. But that still doesn't justify the fact that the CD2000 at $200 barely sounds better than the low-end Grado headphones that sell for less than $100, even with a good amp.
And with the discontinuance of the CD3000, the CD2000 becomes Sony's top-of-the-line headphone that isn't a special-order item.
Honestly, if my only choices were between the CD2000 and the Senn 590, I'd pick the CD2000. But with Sennheiser replacing the "bionetic" series with the new 5#5 series, I'm finding the CD2000 even harder to recommend than ever.