I have done my research. I have visited over a dozen regular mattress stores and 5 better mattress stores,read the latest 18 pages on this forum and read the content of many other sites from raw material suppliers to mattress manufacturers. I finally decided I know enough to make my decision. I have decided on a SleepEZ 10”. But I decided too late. I started building a platform form base worthy of such an investment. Doing the work is getting harder and harder as I am only able to get 4.5 to 5 hours of sleep and wake feeling like I have been kicked repeatedly in the back. My current innerspring mattress and topper have a 5.3" depression within 15 minutes of getting up and 3.1" depression after 7 hours off the bed.
At this point, I am going to buy the required slats and put them on my ugly old metal frame and place my order with SleepEZ. Better for the mattress to be slumming for a bit and me sleeping on it, than me suffer a power tool accident from lack of sleep.
PS Phoenix your consistency in responses and cross post linking are amazing. Many(most) forums could use your skills along with a lot of government websites. Thank you for your work and knowledge.