We use it and our child haw few tantrums and has never had a meltdown. We also follow 1-2-3 Magic now that he is approaching 2 yrs old. But behaviors are divided in 3 categories: good (green light) behavior, annoying (yellow light) behavior, and unacceptable (red light) behavior.
We found that most white noise machines didn’t really do their job when baby was screaming. At those times, as Dr. Karp teaches in his life-saving book “The Happiest Baby on the Block”, you need a loud sound, so the baby can hear it over his own screams. With this CD you can adjust the volume accordingly.
I read the book when I was pregnant, loved it and have been using the 5s’s since my son was born. It was only a half-hearted effort, though. Two nights ago, I couldn’t stop the crying and finally pulled out and used the swaddle blanket I had received. He fell right asleep and so did I!! Four hours later, I woke up on my own and went to check on my son who was sleeping soundly.