One in every bedroom
I love this sound machine, and wish i had discovered it when my oldest child was a baby.  I have one in each of my children's rooms and one in my bedroom as well.  It is great when one child is sleeping as it drowns out the background noise of another child or just household noise.  It is small and lightweight enough that i take it on vacation with us. It helps eliminate hallway noise in hotels and is great when you have a child that turns in early. It is a soothing (but not distracting) fan like noise.  Highly recommend it!
Rating: 5 stars