I have read it. M.R. James “New Testament Apocrypha” is an excellent book. You need to take these books with a grain of salt however. Like a lot of them were written as pseudographia, and seem to tell stories that troubled early Christians. For example, The Acts of Peter, the author was definitely concerned of the Gnostic sect of the Simonians who followed Simon Magus. The books however do shed light on a lot of the traditions we do hold, such as how Peter and Paul died, the names of the Magi which are in the Acts of Pilate(Gospel of Nicodemus). One book that always also struck me was the Acts of Paul, and especially the second part of the book known as The Acts of Paul and Thecla. Many Scholars believe this book was almost included in the Canon but later rejected because it emphasized females as being able to be priests in a sense. But yah read the Bible, and grasp it, know the truth of the Bible. And once you do that, reading the New Testament Apocrypha is okay. It however can become confusing if you do not have a firm grasp on the accepted books, and need to realize these books were kept out for just cause. The only books I believe should be in the Bible are mostly Old Testament books such as The book of Enoch, and Jubilees.