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I tend to sleep on my stomach or side and my wife sleeps on her side. Occasionally I will sleep on my back, but not as much. It is soft but I wouldn't say you sink in to it. I read some reviews of people either saying it was too hard or too soft so they just put a mattress topper on it and they were satisfied. Like I said, a Cal King for only $400 is unheard of. I used to sell furniture and we had a mattress department and some of them cost upwards of 10K. That is asinine. Even the low end ones were a grand. I suppose it might not last as long as some of the others, but for $400, I can just buy a new one every 5 years :) Best of luck with your decision!

The warranty says 10 years, do you know what it covers? Like .75 inch sag in the middle? I heard if you buy mattresses from amazon you don't get the original warranty from the manufacturer, and have to go through amazon. Just wondering if you know anything about that. Thanks.

TBH I didn't really look into the warranty. I saw the price. I saw and read up on the reviews which I gauged to be mostly positive. I saw the it was made in the USA which I loved. All that combined sold me. On top of that, I wouldn't have been able to fit a standard Cal King up my stairs without it being in a box as this was.