According to Christopher Tolkien, this new book published in 2007 is a compilation of Tolkien's many different drafts of the story into one complete whole with only the barest editorial additions. A word here or a word there. Most authors today probably don't get it that good from their editors.
I also have The Lays of Beleriand which includes the unfinished Lay of the Children of Hurin, but before now I had not been motivated to read past the first few lines of this alliterative poem. Last night, though, I read about 40 pages. It is a lot harder to read and not nearly as enjoyable for me but it's kinda fun in it's way. I have found that it is absolutely necessary to read alliterative poetry out loud. Probably my brother thought me insane as I chanted that,
War was waked in the woods once moreJust a few thousand more lines to go.
For the foes of faerie, and it fame widely,
And the fear of that fellowship, now fared abroad;
When the horn was heard of the hunting Elves
That shook the shaws and the sheer valleys...
Even in Angband the Orcs trembled
[when] the word wandered down the ways of the forest
That Turin Thalion was returned to war (36).
Tolkien, J.R.R. The Lays of Beleriand: The History of Middle-earth III. A Del Rey Book, Ballantine Books. Yew York, 1994.