I think it's a useful book, but "no-cry" is a bit of a misnomer because although it doesn't advocate any form of control crying, some crying is unavoidable if you're changing something the LO has become used to and needs (or thinks they need) in order to sleep.
For me, the advice that the bedtime settle is the most important had the most dramatic effect - but no amount of Pantley Pull-Off etc. would get DD to go down awake and go to sleep without protest, so I had to grit my teeth and let her get it out of her system for a couple of nights.
After that, the overnight awakenings (which had been a minimum of 5) dropped dramatically first to 3, then quickly to 2. I did that at 7.5mo. Now, at 10.5mo, DD sometimes only wakes once. I feed her when she wakes up, but she tends to unlatch herself when she's ready to go back in her cot.
I've also used other advice in the book and gradually, things are improving.
No, DD isn't sleeping through the night, but my aim was 2 wake-ups or less and we're fine with that.
The book is very helpful (although a bit depressing if you have a nap-fighter - EP is a great believer in good naps=good night time sleep), but it is not a quick fix, so bear that in mind!
Overall, I would recommend it.