I am using the ZD right now for another week for evaluation. I just spent today shooting two magazine features with it but won't be downloading the cards until tomorrow.
Some test shooting I did with it earlier on the week shows it to have superb color rendition, very sharp etc.
One of the "give-ups" on it is the small LCD. However it is very visible outdoors in bright sunlight and certainly is useful enough to check composition. It does have highlight and shadow warnings but I have not used it yet. You can also zoom in and move around your frame to check focus.
It is very easy to use and the button and menu system in very intuitive, at least for me.
I will certainly be posting results on my blog
SecondFocus and click on blog; and will post some more info here as I go.