Knee Pillow for Side Sleepers

I had hoped that this product would work better for me than it has. I am normally used to having a small pillow between my knees as I sleep. I thought this particular leg pillow might work and be less intrusive. However with the change I do not feel like my legs are supported correctly and when I flip on my back I cannot use it under my knees for my backs sake. This is my only experience, and I realize that I might be different than other people. It appears to be well-made and has good ventilation for between the knees and memory foam so my three star review it's only because of my experience, and not because of the product itself.