I’m a sleep geek. I like trying new ‘this will improve your sleep’ items that are sold by reputable companies like ResMed (although strictly speaking I don’t think this item isn’t made by ResMed). The pillow does what it says on the box. It is a light weight hollow-fill pillow that plays a preset list of soothing music that only you can hear (I can’t explain the science). Put your head on the pillow and that’s your part done. The music did seem to help me to drop off to sleep faster and I was semi-conscious of the music during the night when I was moving into a lighter sleep. The pillow is app driven allowing you to select the music and the length of time it plays. I’m going to stop it playing all night just because listening to the same track was getting annoying. The pillow is mid-sized in both height and filler density. It is the width/depth of a standard pillow. It is not a latex or memory foam pillow. It did not make my head hot or cold. I’m a big guy prone to sweating and this didn’t happen while using the pillow. When you play the music it sound like your hearing it under water, it can be a bit muddy. The instrumental music can be heard more clearly than the sounds of nature eg a crashing sea etc. The pillow is powered by a rechargeable battery that is also a Bluetooth connection to your phone, you can connect a cable to the earphone jack on the unit which allows you to play music from an MP3 player etc. The unit can be positioned in the pillow or, thanks to a 1 metre plus cable, outside the pillow eg on a bedside table. The unit powers on/off, advances to the next song and volume control. These features can also be controlled via the app on the phone. The app is fine, it won’t win any awards for functionality but it does what it says it does. Overall, is it helping me get a better sleep along with my CPAP machine? I feel that it helps me get off to sleep faster and my bed partner can’t hear the music. Whether that’s worth $189 is for you to decide. I hope the quality of the pillow and the electronics lasts so at least I can feel that I got value for money.