Here's my RYM review (4 out of 5 stars):
Loved/bought the recent "Eat That Question" doc but this one is a very different beast. They compliment each other wonderfully. Alex Winter (Bill from "Bill & Ted") is a friend of the family so got access to all the their home movies. Also got all the talking heads you'd want minus the children (which makes sense, given their recent legal battles, which probably has Frank rolling in his grave), including Gail, probably filmed not long before she died. And like "Question", most of it is narrated by Frank himself.