I was ambivalent, too, but ended up doing the same thing. I still am not sure what exactly it adds (or lacks without it), as everyone is getting and giving conflicting information. So, I ordered it and am hoping it's worth it.
Originally Posted by tunafish
I am ambivalent about ZDH. Initially, I didn't order it, but changed the order at the last minute to include it. Not sure if I did the right thing or not. It's pretty expensive and adds complexity and I don't know how useful it is. I decided against IAS (4 wheel steering) after I read complaints about tracking problems and expense associated with aligning this system on the 7 series.
I did skip IAS. After having it on my 7 (and growing to hate it), I will never order it again.
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