I have owned one of these in the past and it does position your airway to limit snoring. It is a little firmer than I remember the first one being that I paid $150 for from Sharper Image a few years ago and left in a motel room, never to be found. It can cause a crick in your neck. The pillow case as a "bonus" leads you to believe that you are getting an extra pillow case when you get just one and there is no alternative available pillow case on the market that will fit this product. Also, the original pillow cases for this product used to have a sleeve for your arm which kept you from repositioning yourself during the night negating the positive effect of the item. Luckily, I still have one of the old cases.