On the plus side, this pillow does a great job keeping my head from tilting forward at night, and I don't have to go to the chiropractor nearly as much, which is awesome!
The biggest problem with the pillow is the materials. The polyester is HOT and makes my face and body overheat at night. I had to go buy a really nice silk pillowcase just so I could use the pillow. I really wish they could use cotton, wool, or another more breathable material.
Also, the material on the thinner side of the pillow gets kind of beat down after a short while, but since I mostly sleep on my side, it's not a big deal.
Also, their guidelines for side sleepers are NOT helpful. They tell you to place your head on one of the raised sides if you sleep on your side. Doing that puts my neck WAY out of alignment. For me, I need to put my head in the hole in the middle when I'm on my side for proper alignment.