Hi npfd,
Just to reinforce CentralPA’s comments … I would start with the tutorial post (it’s linked in the top right corner of the page and at the bottom of all of my posts) and perhaps reset “how” you look for a mattress.
Outside of the suitability of a mattress for your specific body type type and sleeping positions which you can assess with careful and objective testing for PPP (Posture and alignment, Pressure relief, and Personal preferences) … a mattress is only as good as it’s construction and the quality of the materials inside it.
The description you posted says nothing at all about the quality of the materials in the mattress and Simmons and most of the major manufacturers use lower quality and less durable materials in their mattresses (especially the comfort layers which are the first to soften, compress, and break down) than their smaller competitors in the same price ranges.
Without knowing the specifics of the quality of the materials inside your mattress … you would be making a completely blind (and probably very risky) purchase and there is no way to make meaningful comparisons between mattresses. You can’t “feel” the quality of the materials in a mattress.
I would avoid both of the Beautyrest mattresses you are considering.
Phoenix