It's really good. Garland has lots of good work which is illustrated well, and he's a very interesting person which is also handled well by the lengthy interview. Unit Editions continue to make good graphic design books.
Garland is most famous for his First Things First manifesto, even though there's much more to him than that as the book is testament to. The First Things First manifesto is interesting to me in my current job for obvious reasons.
Worth buying the book.