I went at the event organized here in Oxford and bought a copy to be signed by Alan Lee.
So, I am greatly appreciative of almost t all the books published posthumously by Christopher Tolkien, especially The History of Middle-earth series. This one has perplexed me a little, because all the stuff was already published, mostly in "The Book of the Lost Tales pt. 2" and "The Lays of Beleriand". I admit it is useful to have all the Beren and Luthien stuff on a single book, but then I do not understand why he removed the initial portions of "The Lay Leithian" (First canto and part of the second).
Still if you haven't read those books there is plenty of great stuff here, if yo do not mind poetry. Just openaning some random pages, and reading a few lines gave me great pleasure once again. You get the most detailed (basically the only) description of Angband and Morgoth's throne room, if you are interested in comparing that with Golgotterath.
