I am thinking about getting the Platinum card because of the rental car benefit (and some others, but this is the basic kicker).

I was under the impression that - with some exceptions - the amex plat would give me car insurance world wide so I do not have to pay the rental cars fees.

This thread tells me that there is a difference though?
It still could be easier than paying the rental car copmpany about 20$ a day but I though I would have that covered.

(Additionally, california rental companies seem to insist on paper work to show your coverage - how does that work with this kind of insurrance?)