I had a knee surgery 14 days ago and was able to sleep only on their backs. This is a pain if one never does. Back pain is the result. My physiotherapist advised with a side sleeper pillow. After several hours of search on Amazon I came across the seven. I wanted only to spend less. But my Nackenstütz- Pillow has indeed already cost 130. Afternoon ordered with Premium click, the next morning it was there. It's really super processed. The Seven is also properly shaped headboard. I first wanted nothing to do with headboard, because I have a good cushion. Had I not thought that the head and neck are so good. The transition from the pillow on the mattress is very well done. The long part is round, not flat. The cover is just fine and you can re-order in other colors. I have 3 nights needed to sleep with the operated knee on the side can. Now it goes well. I should have done that a long time more. I think "no" it is not so good for your knees. So clear recommendation, good value for money. Many greetings to all side sleepers ;-))