Yes, I watched it! It's a really good surface scratcher of the larger issue with cults and how they prey on vulnerable people, with the main route to it being a view into the Duggar family.
I liked that it focused on the political side of IBLP and that it let the victims of it be heard on their terms, they seemed very comfortable and only told what they could handle.
But it does feel a bit surface level and more like an introductory viewing for those completely unfamiliar with the above. But I think that's just because there's so much more ground to cover on this.
It also deals with quite heavy subject matter, so do be warned.
My least favourite thing about it is the music they chose, but this is a general issue I have with most documentaries.
Anyway, definitely worth a look in my opinion! The epsiodes went by so fast.