I own the LCD-3 classic and the LCD-X. Like many of you, I was excited with the the buzzword "Fazor technology". I prefer the LCD-3 to the LCD-X, and the HE-6 to the LCD-x. There is no chance I'll be upgrading the the LCD-3 to the Fazor because I do not want to touch that marvellous bass. Loose bass is something Audeze was not known for, but with this upgrade they are. LCD-X in my opinion is a completely different sounding headphone than the classic LCD-3 and LCD-2, a lot less bass quantity with more treble presence and imaging improvement.
I for one would still pay a premium for the classic LCD-3 because of the fantastic bass and intimate presentation.