Very well -- and wittily -- written up in this review by Peter Suderman. http://www.slate.com/articles/arts/culturebox/2013/07/hollywood_and_blake_snyder_s_screenwriting_book_save_the_cat.2.html
The wit comes from a link to a second version of the article that many people will miss and not click on, to their detriment. It's the same article they've just been reading, but now with its beat-by-beat formula -- the same one discussed in the article and in the book -- inserted, to show you that he followed the formula when writing the article. http://www.slate.com/content/slate/sidebars/2013/07/now_playing_at_your_local_multiplex_save_the_movie.html
