Useful and comforting
First used to block sound for day-sleeper, we later bought another to help with baby fussing not waking our toddler.  Now, in a new house, we bought another for the older kids room, so they're not bothered by noises of doing dishes or watching TV at night.  I thought the "one in every room, can't sleep without it" was ridiculous when I first investigated the product, but now I agree.  The world needs a little background white noise.  I wish it were cheaper, but I'm willing to pay it (several times, apparently).  I recommend it to everyone I can.
Rating: 4 stars