At first it was nice and firm. I've had it for about 3 years now, and it's softened up with use. The middle part is still firm since no one sleeps in that spot. I think I might give in and buy a new/traditional mattress in a year or two. I like to be able to flip over mattresses every now and then. You can't do that with this one.
Good bed. Firm overall. Had about 2 years. Only issue us the length of time it smelled lime a chemical factory. After you take it out the bag it has the worst smell ever. Do not attempt to sleep or put bedding on the bed till the smell is gone. Which took 7 days and lots of baking soda. About 7 boxes to soak up the fumes. everything in my room had the smell of the mattress. Just be aware.
This is a great mattress. I have had it for over two years and for sure I am a very happy guy. You can't go wrong with this product. My mattress is firn which at first is very firm but over two or three weeks settles down into the perfect mattress for me.