I quite liked it. There are interesting and helpful ideas in here about living life in the moment, accepting death, and being more open. I was never bored and I learned plenty. Great explanation of meditation in Episode 6, episode 8 is heartbreaking and beautiful, and I've always been particularly intrigued on the theory touched in season 4 and related to the DMT discussion.
I'd give it 4.5 if I could do so on here as the connecting plot starts slow and focusing on both the animation and conversation can get hard despite them often being loosely correlated.
Likely won't be for you if you're pessimistic or unwilling to hear other points of view.