Hi cinn,
I’m sorry to hear about your experience with your Satbed but I appreciate you taking the time to share it.
Some manufacturers aren’t quite so “rigid” about their trial period and are more willing to make exceptions if it’s just a matter of a few days but it’s unfortunate that they weren’t one of them.
I’m not sure who advised you of this but there is much more to choosing a mattress that is suitable for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) than just the thickness and density of the layers. You may find that one mattress that uses 3" of 5 lb memory foam with a 7" polyfoam base layer may work very well for you and another that seems to have the same or very similar “quality” specs may not be suitable for you at all. Density and thickness are just two of many factors that are part of the design of a mattress that makes it suitable for a specific person to sleep on and I would tend to avoid using specs to decide which mattress is best for you (although knowing the “quality specs” of a mattress is an important part of identifying any weak links in a mattress and making meaningful comparisons).
The first place I would start your research is the tutorial post here which has all the basic information, steps, and guidelines that you will need to make the best possible and most suitable choices … and know how to avoid the worst ones. It also includes links to some of the better online manufacturers and retailers I’m aware of.
I would keep in mind that generic firmness ratings like “medium firm” are highly subjective and relative to each person’s perceptions and can also vary from manufacturer to manufacturer. They really have no specific meaning.
I would be cautious about Amerisleep (and their sister companies Astrabeds, Simply Rest, and eSleepmasters). You can read more about them in post #2 here and the posts it links to and a forum search on Amerisleep (you can just click this) will bring up more information about them as well. They have a lot of websites that “seem” to be independent rating sites but they all lead back to the same place and are all about marketing more than anything else.
The Memoryfoamusa mattresses are made by Silverrest/Springfield and you can read more about them in post #4 here and the posts it links to. I would avoid any memory foam manufacturer that sources their foam in China and isn’t CertiPur certified and they certainly wouldn’t be my first choice either when you have so many better options available to you.
Phoenix