This more of a text book than one to read for pleasure. It does give a good history of changes in the language from early to late, and explains how the grammer of the language simplified to where we are today. I bought it for amusement, having read progressively older and older books, and having got to Chaucer, I thought it would be interesting to get a book on "how to read" even older material. It serves this purpose very well. I haven't got as far as reading the middle English prose and poetry in this book. They range from early to late.
I was born and bred in Australia 65 years ago, and allowing for 'colonial lag', I remember hearing older people speak words for which this book gives translations into modern English. Like 'aks' (pronounced 'axe') for 'ask'; 'five and twenty'. and similar variations, for 'twentyfive' etc. The oldest person I can recall chatting to was born in 1870. I was 10 at the time.
I thus find it easy to read late middle English.
If you are interested in the history of the English language, and are interested in how it evolved (is evolving?) this is a good book to get.
Bill