We had dual zone mattress
We had dual zone mattress in the past so going to a medium firm from soft took some getting used to but now it’s fine. Very supportive in our sleep positions. I mainly sleep on my back which is very good but not as comfortable when I side sleep. My hubby loves it. He appreciates the firmness but the softer top for side sleeping. We are both plus size and it feels supportive right up to the edge.