If there were awards for "best author's notes" these would be my nomination. I have quoted them extensively in private correspondence. My favorite lines are: "the characters are grumpy, quarrelsome, spiteful, cruel, arrogant, and a variety of other unpleasant adjectives besides.... But the Elves of the Silmarillion did lie, steal, fight, discriminate, kidnap, covet, attempt rape, betray, murder, and so on. And in Tolkien's early drafts, they were far worse."
If that wouldn't make someone want to read this story I don't know what would. (And the tale lives up to its billing!) Oh, yes, beautifully written as well.