This didn't end up being what I expected - I thought it'd be more like Children Of Hurin, a single long narrative. Instead it seems to be something a little more stitched together from older versions of Beren And Luthien, and most of it verse which, it turns out, Tolkien was pretty good at. It makes for a choppy read as Christopher Tolkien bridges narrative gaps with earlier or later pieces or fragments, so it doesn't really form a whole and ends up being something framed by the usual careful and respectful scholarly exegesis of Tolkien's composition. Still, pretty readable and fairly enjoyable on the whole, but I think the narrative in the Silmarillion might be more satisfying as a read.