Hi mattressseeker,
Have you read the tutorial post?
Simmons is specifically one of the “major manufacturers” I would avoid and that use low quality and less durable materials in the comfort layers. I would never buy any major brand mattress (or any mattress for that matter) unless you know the specific quality of all the materials inside them and can confirm that there are no obvious weak links in the mattress. You can see an example of the type of low quality materials you will typically find in a Beautyrest Black mattress here (compare this to the foam density guidelines in post #4 here and you will see that there are significant weak links in the mattress). I would also keep in mind that these are their upper end mattresses and the lower end are even worse.
I would be VERY cautious about buying this and yes there are many people who have learned the hard way that low density foams in the comfort layers don’t hold up for very long and will need to be replaced (most likely without warranty coverage) much too quickly.
Phoenix