Surprised there are no reviews for this. Suffice to say it's a modern classic of Christian spirituality, the only (relatively) recent book I've seen which can remotely be compared with the 'Imitiation of Christ'. The similarity lies in the fact that, though written from and about the monastic life, it is broad and deep enough to take in what Christianity means as a whole, and is applicable to anyone.
It is a book mainly about general principles, not a detailed manual of contemplation. As such it is very wise and insightful - one of those books which puts your own vague thoughts into clearer, more compelling form. It does not argue for the tenets of the Church or monasticism (less still against them), but offers a new way to understand them.
I should mention I read a different edition to the one available here.