My little guy just turned 6 months old today, and I just bought Dr. Ferber's book "Solve Your Child's Sleep Problems." I'm just curious who has used this method and what were your experiences with it. I want the good and the bad!

Thanks in advance for giving me your input!
Re: Ferber Method
We did it at about 6-7 months w DS. He would only fall asleep in his carseat.
The checks never worked and I ended up letting him CIO for nearly an hour. It was by far the hardest thing we've done, but the night after he cried for 20 min and then never fussed more than a minute or two after that. It's not for everyone. He still woke once for a bottle until about 9 months. But I could put him right down to sleep instead of rocking him and he wasn't waking 2-3 times.
W : 01.11.13
#3 : due 11.02.15