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2ndgen how long have you had you z3, and have you modded it (bypass, wallpapers, backgrounds)??
I actually have the z2 which is pretty much the same head unit. I have had it for almost a year. Mine is bypassed and I have uploaded custom backgrounds on to it. Both are extremely easy to do.
I suggest you check out http://avic411.com
for more helpful info on how to do the bypass and upload custom backgrounds.
If you care about picture quality get the alpine. It actually has a proper screen resolution. The Avic is less than half the rez of the Alpine and completely insufficient for watching DVDs.