There's a lot of bullshit - and most people are drawn in by pseudoscience nonsense. I was interested in seeing what people were talking about and the perspective change (also Sam Harris, lots of historical people, Huxley, What the Dormouse Said, everything I'd read etc.)

I tried it basically with as most preparation as you could possibly have and it wasn't enough. There's more detail in my posting history, but I'd suggest caution.