I’ve had my mattress a little over a year now and I’m getting ready to throw it out and spend another fortune on something more supportive. 
I’m very disappointed and put out by the lack of firmness of this “firm” mattress. Helix did send me a topper which was supposed to increase the firmness, but has done little to change the comfort. 
I had a spine surgery shortly before I purchased this mattress. My old mattress was very firm, but old, so a new mattress should have helped. It didn’t. Most nights now, I toss and turn and can’t get comfortable. I roll towards the middle where it’s sinking. I wake up in a lot of pain now. I am 130 lbs. My husband is 190 lbs. I’m overly disappointed with this product.