Still too hard to sleep on
I slept two hours when I first got it.  I did not feel anything.  The next night, I slept with more hours but did not feel comfortable.  Per instruction, I removed the insert and put the case inside my pillow.  It was too high and I felt shoulder pain the next morning.  Then, I switched to a softer pillow with the case inside.  Still, my shoulder was so stiff and painful.  This pillow supposed to help me to relieve my headache and neck pain but gave me more pain instead.  After one week of trying, I need to return it.
Rating: 2 stars