Pros: An attractive sound machine with a unique, thin design. Offers 30-, 60-, or 90-minute timer selection and nature sounds and white noise options. Features a notch in the back for hanging the unit on the wall to free up space.

Cons: The wind sound feature is distracting and unpleasant, and the volume does not go as loud as some users prefer.

Summary: A unique design a variety of sounds, but users who want both nature and white noise sounds will get better quality with the Ecotones and a better value with the Conair.

Pros: Unlike other models we tested, this model's sound is not prerecorded, but comes from an actual fan inside the unit. Recognized as the official sound conditioner of the National Sleep Foundation.

Cons: Fewer sound adjustments and not as rich sounds as the Ecotones and LectroFan models. Also lacks nature sounds.

Summary: Ideal for users who want the consistent sound of a live fan, but the sound quality and volume control is lacking compared to others we tested.

Pros: Easy to use with simple features and a compact design. Features rich, high-quality white noise or fan sounds that can be turned up loud to drown out sleep-interrupting noise. Its sound quality is similar to the Ecotones for about half the price.

Cons: Though its sounds are high quality, it lacks the nature sounds that other models have.

Summary: A great sound machine for users who prefer white noise and fans sounds, and like a model with a basic design.

Pros: An inexpensive model that offers similar sound options and timing controls as more costly models we tested. We love that it is also compact and easy to take along when traveling. Also features an extensive volume range.

Cons: Sounds are not quite as rich as those of more costly models, and looping sound interruptions are somewhat noticeable.

Summary: Budget-minded users who want a basic model will be pleased with the quality, features, and the price.