had some real bad beck problems... bad to the extent i couldnt do anything, went to the Doctor, had a brace - the works. got this pillow and the pain went away after a few days (which yes, i can see you thinking that the pain probably would have gone away either way, but i am sure it expedited the process) and didnt come back since. i also sleep better.
it's only 4 stars because the memory foam quality is not that amazing, but the shape, medium quality and price make it a 4 star item.