I had to get this pillow because conventional pillows would either be to fluffy or to thin, and either way, I would wake up in the morning with slipped disks in my neck and be in severe pain. This pillow gives the exact curvature of support to the neck and lets your head rest almost completely back when you are lying on your back.
When you sleep on your side, it LIFTS UP your head so that you have the correct support, and don't wake up with slipped disks.  I used to go to the chiro every 3 days, now it is more like once a month, and mainly due to stress/muscle tension pulling my neck vertebrae out, but not from sleeping wrong anymore. THanks Tri-core!