Note: Since I have never had neck problems and can sleep very well, I can not rate these aspects.
It came in the use of at least not to neck pain or headaches.
My sleep is generally become quieter, according to my better half "wallow" I am less!
Downside to the pillow is the heat in the head. It is much warmer, let's see if this is to endure in the summer.
In general, I would recommend this pillow!