If you mean by "non-moral-realist" "someone who doesn't think objective morality exists," I think that you've expressed my current reason for why I haven't read the meta-ethics sequence.
All the terms in this area have nearly as many definitions as they have users, but I think you'll find the meta-ethics posts to be non-morally-realist. Oft-repeated quote from those posts:
Not upon the stars or the mountains is [some aspect of morality] written."
So after reading SarahC's latest post I noticed that she's gotten a lot out of rationality.
More importantly, she got different things out of it than I have.
Off the top of my head, I've learned...
Where she got...
I've only recently making a habit out of trying new things, and that's been going really well for me. Is there other low hanging fruit that I'm missing?
What cool/important/useful things has rationality gotten you?