Hoping not to take this post off topic by straying into the medical aspect of this subject and therefore breach posting guideline 21
I used to suffer with neck pain and could not figure out if it was too many pillows (4 on some occasions

) or too few which I found very uncomfortable. I purchased . I think it has improved the situation but as I now do specific daily back/neck exercises under physio guidance I can't be 100% sure.
I did speak to an excellent knowledgeable bed salesman after I bought the pillow and he maintained that there was no evidence to prove that these pillows are any different to any others. He did say though that some people do find some relief with them so possibly worth a try. I only went for the cheapest version.
Some
general advice from Harvey Norman about buying a new pillow.