A mere six hours of break-in is probably too early to make an eval. You should let the thing stay on for at least 24 hours continuously as well. How did you come by a NOS unit?
I got a great result with a used CD-D running into either a Bidat and Idat, both modded by John Wright. I still own both DACs. I can't tell you about the CDD separately since I never used it with a non-Museatex DAC.
Unfortunately, my CDD failed, and these units can't be repaired since there are no longer any replacement drives available. I think you are lucky to have a NOS one, and you might want to try a Museatex DAC with it before drawing any final conclusions.
I got a great result with a used CD-D running into either a Bidat and Idat, both modded by John Wright. I still own both DACs. I can't tell you about the CDD separately since I never used it with a non-Museatex DAC.
Unfortunately, my CDD failed, and these units can't be repaired since there are no longer any replacement drives available. I think you are lucky to have a NOS one, and you might want to try a Museatex DAC with it before drawing any final conclusions.