This mattress was fine to start with. Definitely absolutely not the medium firm advertised but comfortable enough, though if there was more than one person sleeping the mattress moves so much when the other person moves. 
I spent so long trying to find the right mattress within budget that could stop worsening my chronic pain condition, as the previous mattress was. I’m so sad to have wasted money on this which has become so uncomfortable with springs digging into my body preventing any good sleep. Providing no support and waking up in worse and worse pain everyday. Getting off the bed is hard with my condition too, as the mattress moves so much. The quality has so quickly worsened and I have only had it since March. The “high-density polyester padding and a layer of memory foam for extra added comfort” they boasted about seems to have deteriorated in that time. I am so disappointed and am having to sleep in the living room til I am able to afford a replacement.