Bought mine after trying it at the store on a mattress like the one I have at home.  For a big man who sleeps hot, the pillow is perfect.  I no longer turn the pillow over and over, looking for the cool side.  My head is huge and the pillow supports it without causing neck strain.  I often sleep with one arm under the pillow because of a torn rotator cuff and I don't wake up with no feeling in the arm any more.  Concerned about cleanliness so I paired it recently with a 100% Flax Linen pillow case which breathes and allows the pillow to do its job.