Hi mattressseeker,
Not many of the forum members here would have purchased one after reading the tutorial and learning more about mattress materials but you can see a few examples here and here and one of our members actually cut theirs open to do mattress surgery after 6 months and you can see their comments and pictures here. A forum search on Beautyrest Black (you can just click the link) will bring up more comments and feedback about them as well and a google search using search terms such as “beautyrest black issues” or similar would bring up many more.
You can see my earlier reply in post #4 here about recommending specific mattresses or “what” to buy but but if you follow the steps in the tutorial post one by one about “how” to choose you will have the best possible chance of success.
That would be like asking whether a Ford or a Chevy or a Chrysler weighed more. It would depend on the specific mattress you are considering and the quality of the materials inside it.
I personally wouldn’t consider any of them (see the guidelines here). While they do make some mattresses that use better quality materials they are still overpriced compared to many others that use the same or better quality materials and components. Asking someone that was knowledgeable about mattresses to choose between them is somewhat like asking them to choose their poison.
Phoenix