In terms of functionality, the 27" LED display is vastly inferior to the 30" ACD. But since the form factor of the 27" display is thinner and shinier than the 30", Apple fanboys will love it and continue to defend it. To Apple fanboys, form factor is more important than functionality.
I actually thought the old aluminum ACD were prettier than the current ones. I still do actually. I've been trying to find a good price on a used one, but they're still pretty expensive. Apple monitors don't seem to be worth it for me.