Retired chiropractic physician here.
Had a TempurPedic pillow, which is designed for spinal support but tends to get too firm when room temp is below 70 degrees.
Worst night of trying to sleep I can remember.
Chunks of foam don't know where to assemble. Good luck to the layperson trying to align their spine correctly using this pillow—let alone having it last all night.
Takes endless tiny readjustments to get foam in a position that is comfortable, never mind orthopedically correct.
Then, every time you move, loud squeaking of the foam pieces rubbing and scraping across each other. (Sounds loud only when ear is touching surface, such as during sleep attempt.)
Then you start to EXPECT the loud squeak each time you're about to turn over.
Then you have to reconstruct the foam chunks for the new position—except the average consumer cannot hope to do this in the dark while dead tired.
Not wanting to rebuild a new shape again and again, they just use one foam configuration and hope the neck will be supported.
The joints of the spine don't work that way, and the muscles will spend the night trying to correct it. Result: awaken with neck ache and muscle spasms that can last.
I got a TheraPedic for 40 bucks and it has been a dream. (No, I don't work for them or sell their stuff.)
Just my honest educated opinion.
Product or Service Mentioned: Mypillow Pillow.
Reason of review: Bad quality.