I need a new mattres too, I think.
Got one of these Kooi mattresses a bunch of years back... I tink it's the firm version.
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It worked great and I loved it for years, then suddenly two weeks ago I started waking up with the most atrocious upper back pain in the morning hours I've ever had. I just assumed it stress during sleep or something, but I don't know anymore.
It goes away almost completely within the first 30 mins once I wake up.... is that normal?
I could sleep on beer cans and a mieliesak in the past, now suddenly I'm dealing with this?!?!
The only thing I can think of is that the foam on the Kooi got to a point suddenly where my spine is just bent too abnormally due to the slight concave area forming at your torso area due to it getting old, and that somehow that firmness combined with that slight curve is enough to apparently send you into the abyss of backpain.