This is THE definitive anthology of Middle-English verse romances and a must own for any student of Medieval literature. It collects together stories that you just won't find anywhere else as accessible.
My personal favourite is Sir Orfeo from the Breton Lai - the Medieval version of the Orpheus myth where the heroine is kidnapped by the queen of the fairies.
Other highlights include Havelok the Dane, King Horn, Athelston and Gamelyn and Floris and Blancheflour (A clear inspiration for Shakespeare - The Winter's Tale)
We have everything here: Proto Robin Hoood, tales of King Arthur (Sir Gawain makes two appearances) to classic folk tales.
This edition is clear and easy to read, presenting the Middle-English with plenty of room for annotation.
Its indispensable and a gem for any library.