Rail and drive pass?

We are a group of 6 adults planning a trip to France in April. We land at CDG Paris and head immediately to Amboise, Sarlat, St Emilion, then back to Paris, 12 days total. We are thinking of getting the France Rail & Drive pass. The other option is renting an automatic minivan at or near the airport. I understand that automatic minivans are not plentiful. If driving from the airport down to Amboise is difficult we would take a train going south to a station that has an automatic minivan available for rent. Has anyone ever used a Rail and Drive pass?
Any advice? Thank you
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