Read this for work. I was very skeptical of the writing style and the "conversations" with clients that seemed too tidy, too convenient and too scripted, but the ideas were compelling and the examples were helpful, if somewhat contrived. I finished this about a month and a half ago I suppose, though I am just now writing a review and I can definitely say that it has been effective and helpful in terms of how I approach my clients (I work as a caregiver at a brain injury rehab housing facility) and that despite my cynicism, this is proving to be a practical and useful technique.
On the other hand, the book and possibly the theory itself is so oversimplified that some may find the real world application is quickly problematic, though I don't think that is reason enough to throw the baby out with the bath water. I think of it like most good ideas, they look good on paper, but it hangs on us to be creative and flexible enough to put them into any sort of practice.
I have not read any other books detailing choice theory and this was meant to be a book to familiarize one with the way in which choice theory is applied in counseling, so I think it is very likely that I will follow up with one of the core books on the essentials of choice theory.