I got one of these, it is awesome. It is like a bag of little rocks. https://www.amazon.com/gp/product/B0006HUE94
Once I smash a head crater into it, it says cratered.
It weighs like 20 lbs. No one takes my pillow and if they try, they won't be going very fast with it.
My wife had a My Pillow once, I was not a fan.
I actually use buckwheat husk pillows. It is great, it breaths so it stays cool. You can form it into any height and it stays.
Certainly not for everyone, but I love it.
It takes little bit of a fight to get a cover on it since it like fighting a superfluid.