Product delivered June 1, 2023. First night we sweated more than I ever have during sleep. I was soaked the next morning and my fiancee, who sleeps really cold, was also much too warm all night. Also, it is much too firm than we expected (it's a Medium). The model in the showroom at the furniture store, granted having X number or people try it for X months/years, seemed comfortable. It's been almost 3 months and ours is still way too firm. Her sister visited the last two nights and slept on it and said, "This is uncomfortable - much too firm!" We've gradually gotten used to the temperature, but it does not seem to cool as you sleep on it. If the mattress' life is 40 years +, how long before it actually gets comfortable? I'm 66 so I don't want to wait 20 years (or even 10, or 5) for it to break in.