I have a subscription. It has good stuff if you are REALLY into documentaries. For example, you have finished watching most of the good (popular) ones on Netflix / Prime / etc.
I have it because: 1) I have a 7 yo for whom a bunch of the content is great. 2) It is very affordable. (Like $10 / year on discount or something).
But I haven’t seen stuff that I would get a subscription for. (Think Stranger Things for Netflix)
Their Covid stuff was good for us to have a good discussion with our 7yo