Interestingly, the endorsement cited in the catalogue was by Peter Head and first appeared here on this blog:
... anyone interested in the subject should drop whatever else they are doing and go and buy it ... Brilliant, lucid, learned, naunced, and able to look at things from lots of different angles. Also provocative, stimulating, informative and interesting.
Of course, as you can see, Peter wrote this half way through the book and added, "Criticism must wait until appreciation is complete," which he did in the update.
My impression is that practically all scholars in the field agree that this is a highly significant book, not least as a guide on how to work with manuscripts and the necessary tools and resources for such work. Moreover, it gives a good overview of what is going on right now in the field. Therefore I warmthly recommend buying it, e.g., here or here (paperback). However, it is not as suitable as a "textbook." Hence, the title promises too much in this regard.
While on the subject of Cambridge (publishers and scholars), I must add an aside note. In next week the professor of Philosophical Theology from Cambridge, Janet Martin Soskice, visits Lund university and holds two lectures. The second lecture is titled "Sisters of Sinai: of how two victorian ladies, rich and eccentric, made a priceless find in the Sinai desert and, aged over 50, reinvented themselves as scholars of Syriac and Arabic Christian manuscripts."
Simon Gathercole mentioned here that her book on the subject has recently been published and cited the blurb.