I have used a Core pillow I purchased from my chiropractor for about 6 years.  It has really helped my neck pain and it is basically gone.  I decided to order a new one.  Well,  it is not the same quality.  The dimensions are the same,  but the weight is alot lighter.  It does not have the support and firmness as my old one.  I saw other reviews on this topic, and it is true.  The shape is the same, but so much lighter.  That means the support to the neck and head is not the quality that I had with the first pillow.