would it be a major change...i am pretty happy with the d3...would the nav work that much better i.e more up to date maps and better interface?

anyone else gone from d3 to a z unit?

will my bluetoothe module and ipod connector work with z models?

I just upgraded my wifes D2 to the Z series with my z3 hard drive installed. She likes the Z much better than her D2. Easier POI searching newer maps, etc, etc, The D3 does have more features than the D2, but I have never personally messed with the D3.

Biggest change is probably the SLOOOOOOOW browsing of the iPod interface from the HU and no built-in ability to display video from the iPod. I've never used the D3, but my understanding is it has a fast iPod interface.