This mattress is firm enough for me, yet soft enough for my wife. My favorite features are that it stays cool to the touch, and removes almost all motion transference!
Though it is cooler to sleep on which my husband and I both like. It's not as comfortable on my back as advertised. I still wake throughout the night in pain. My husband has to sleep on a boat for 28 days at a time so the 2 weeks he is home the bed feels good enough to him. But we still wake with pinched nerves, that cause numbing and tingling in arms, hands and fingers.
Mattress was a bit costly, but the sleep I get on it is worth every penny. Pro tip: buy your own sheets and pillows. The ones sold on the site are sadly disappointing.