Pros
There are many people who genuinely care about you and are kind at Navs. The HQ are beautiful and fun travel can be involved.
Cons
For as kind-hearted they are, Navs can be quietly controlling and restrictive. If you fit into their dominant culture, you'll be fine, but if not, there could be bumps. Dominant culture = male, White, individualistic, outdoorsy, American. If you are comfortable in this dominant culture, you'll fare well. But if you have different ideas that the old boys' club doesn't know how to make sense of, they're not going to bend over to make sense of them and you'll stall out. If you're a woman and show any leadership potential, you'll face opposition sometimes explicitly but more often implicitly in the way people treat you and respond to you. Short version: They're culturally incompetent and aren't doing the right things to fix it.