I bought this book for my then 13 month old DS1, used her techniques and within four nights he was sleeping through (HAPPILY) and we have never looked back!! I also used it with DS2 right from his first night in hospital and he has slept through almost from 4 weeks old (again HAPPILY).

And can I say that almost everyone I come across asks how I have managed to have two kids who sleep so well, are so happy and well adjusted and who enjoy going to bed. I also have a two year old that does not throw tantrums. They have suffered NO negativity because of this book whatsoever.
Delta, I'd like to just add something regarding what you've said in the above here.
Nope I have not read this book so I am not going to comment on the book as such however going by all the comments it does not sound like the type of book that I would follow as I 'parent out of instinct' here. That's the best way for our family and the way nature intended.

I would like to add however.... you say your 2yr old doesn't have tantrums? You say this like it's a good thing? Well, it's quite NORMAL for 2yrs old's to have tantrums anyway did you know that?
According to Dr Margot Sunderland (a well known child psychologist)..... "the too-good child who does not have tantrums may have learned early on that expressing big feelings elicits a frightening parental response, and that the price of parental love is total compliance. She explains that the too-good child misses out on vital brain sculpting, meaning that when he faces frustration in later life, he may respond with angry outbursts or struggle to be assertive.

Just something for you to think about.

Also..... it's VERY normal for babies to wake often in the night... it's natures way of keeping them safe (ie from SIDS etc) and close to their parents.. my 13mth old DD still wakes often in the night.... yes we are tired but we manage and we know that one day when she is developmentally ready to, in her own time, she WILL sleep through and she'll be a happy baby for that

There is no competition as to when babies sleep through the night.... .all in THEIR own time. You can't force them to. And if you do.... how do you even know what effect it really does have on them??

Something else for you to think about. But your kids are your kids.... you parent how YOU feel it's right for you and your family so each to their own I guess