The translator, Edward Conze, in attempting to include what is common to most Buddhists rather than concentrating on what separates them, has made some difficult choices and has made them well. Though readability is not too highly stressed at the expense of accuracy, the resulting work is accessible to readers of varying education and interest levels. (Given the difficulty of the ideas expressed in many of the selections included, this is no small accomplishment.) I would recommend this book as an introduction to Buddhist thought and as an aid to further study (though I would not necessarily recommend it as an end to the matter for one whose interests tend toward the academic). The glossary and the list of sources included at the end are both quite helpful.
While I wouldn't necessarily recommend this book as a primer for beginners, it is an excellent introduction to basic Buddhist texts and sources. I have found this text to be quite useful as a reference work and can recommend it as such.