Hi Phoenix,
Thank you so much for your website and forum. A friend from work told me about it after I said I was looking to get a Beautyrest. I won’t be doing that . There is so much information and I’ve taken notes so as to help me narrow down my search. Going back and forth on different kinds of mattresses–hybrids, innerspring, latex hybrid–overthinking it has turned my mind to mush. Now the next step is to just go to the store and lay on them.
I did have a question about two sided mattresses. I am 210lbs. and I sleep on the left and a little towards the middle but the right side is open. If I flip it, will that middle section have time to “bounce back”?
Hi snowflake55,
Welcome to the Mattress Forum! 
When a layer is on the bottom of a two-sided mattress it is evenly compressed rather than compressed more under the heavier areas of the body and less under the lighter parts of the body that have a larger surface area. The bottom layers will also compress less than the upper layers would if the same layers are on top of the mattress because the materials above them will absorb most of the compression forces and these forces also spread over a larger surface area as they travel through the mattress to the bottom layers. In effect the layer on the bottom is resting when it’s on the bottom and any compression will be more evenly distributed over the entire surface. A two sided mattress will significantly increase the useful life of the top layers even with a material as durable as latex and it would be reasonable to expect an increase in lifespan of 60% - 70% (although not twice the durability).
If foam is only used in a certain area of a mattress, that foam will definitely become softer over time, so the goal is also to not only flip the mattress but rotate it frequently to attempt to spread the use over as wide of an area as possible to extend the comfort life of the mattress. And as you sleep near the middle of the mattress, make sure that whatever base/frame you use has appropriate center reinforcement.
Phoenix