The forum can be quite dead at times, if you check it once a week, there will always be something interesting to read/discussion posts to participate in. Just that itself, I would not say is worth the $150 a year (he does not do monthly). I have not attended any of the events or meetups, found a mentor, or participated in the book club, so I can't comment on that stuff.

The thing that makes it most valuable to me, and I'm probably in the minority, is the "curated list of knowledge" (various books, thought papers, academic pieces) and the additional exclusive emails. I constantly find interesting and thought provoking articles, speeches, interviews, etc. I think that part itself is worth the $150 a year.

I am a member of the learning community. I found great value in the transcripts of the Knowledge Project podcasts. The podcast is free but the transcripts are available to the learning community. My favourite recent podcast was with Tobi Lutke (CEO of Shopify) - https://fs.blog/tobi-lutke/. Other podcasts that were super interesting were with Robert Greene, Naval Ravikant and Venkatesh Rao. The forum itself is interesting - there is a regular reading group which I really enjoy as well. It is expensive, but I think it is worth it (or am I simply a victim of the sunk cost fallacy?)..