Probably better to look and decide for yourself, but generally they teach specific techniques to reason more effectively in certain situations.

They introduced me to Bayesianism, which is something I now use extensively in my science career, and I appreciate specific strategies to avoid falling into cognitive biases, and to argue more effectively and honestly, such as steelmanning.

None of their lifestyle ideas really jive with me- I have no interest in things like raising children in a polyamorous group home, or in using consequentialist ethics combined with hand wavy mathematical models to make decisions in regular life.