This thread and specifically your post has changed my mind about the AVIC-Z2 I was going to buy. I currently have Nuvi 350 and have been very happy with the navigation but I wanted to get a DVD player and backup camera in my truck.
However, if the Z2 does not perform the primary function (which I agree that it is being sold as a navigation unit) as well as the Garmin than it is not worth the money to me.
This is really a shame because I was really looking forward to getting one.
I am in the US - does that change things? Is the navigation better here?