I got this pillow from my chiropractor over 6 years ago and I haven't use anything else.  I mainly sleep face up and no other pillow has given me better comfort.  I love how firm it is and how it keeps its shape after so many years.  I take it with me on trips when possible and when I can't, my neck and upper back feel the difference after a day or two.  I love this pillow so much that I can not bear to give it away after I bought a new one this year.