This made a big difference in my comfort right away. I need extra elevation for the upper half of my body due to gastrointestinal reflux disease (GERD). Pillows aren't helpful in this situation because they just elevate your head. This wedge is firm enough and big enough to lift me up the way I need, thereby relieving the problem I sleep on my side, so I still use a pillow. I did find myself slipping down it during the night, but I found that a rolled-up towel tucked under my behind acts as a brake. I'm very pleased with this product and would recommend it it highly to anyone with GERD.