This book is very well-written, but I am not sure how much I could recommend it. It is, frankly, brutal at times, and the reader will encounter the most passive-aggressive character I have ever encountered, in fiction or out of it. This makes for some very uncomfortable reading at times. I even ended up having to skip about half of the last 20% of the book (the sensory-deprivation part) because it was so uncomfortable.
Having said that, the author is very disciplined in keeping the story squarely from the viewpoint of the protagonist, who becomes a less and less reliable narrator as time goes on, and that's an admirable skill in an author. This certainly is not a book the reader will soon forget. The story is so very realistic in the near-future sense that it almost counts as horror.
I can't say "if the author had only done X, it would have been a better book" because this is clearly the story the author wanted to tell, and nothing here is done in any way sloppily or out of line with what the story needed. I can't even complain that it has an unhappy ending, because I don't know how much of the protagonist's happiness at the end was feigned. All I can say is that the book delivers what it promises, whether I really wanted that or not.
So, I just can't give it five stars, but you might.
(reviewed 4 days after purchase)