Hi rocketship,
There is more about the initial break in and adjustment period for any new mattress and some additional suggestions that may be helpful in post #2 here
There is also more about the most common symptoms that people may experience on a mattress and some of the more common reasons for them in post #2 here. I also agree with sheep123 that head and neck issues are often related to the pillow you are using because if you are sinking in more or less to a new mattress compared to the mattress you are used to sleeping on you will often need a new pillow that is either thicker or thinner as well.
[quote]I am now trying to decide whether to simply add a mattress topper or possibly try their updated version.
It would be nice if some company offered a trial period for a mattress topper as well (without having to pay return shipping fees that nearly equal the cost of the topper).[/quote]
There can be some uncertainty and trial and error involved in choosing a topper that is a good match for both you and the mattress you are using because of all the many variables involved but if you do decide to try a topper then post #2 here and the additional topper guidelines it links to can help you use your sleeping experience as a reference point or pointer to choose the type, thickness, and firmness of a topper that has the best chance of success. It also includes a link to the better online topper sources I’m aware of and a list of suppliers that have a good return or exchange policy.
Phoenix