The mattress is firmer than expected. As a side sleeper, I wake up each morning with pain all down my back. I could see how this matress could be great for some back and stomach sleepers though. You get the feeling of sleeping on top of, rather than in. I would describe the firmness as about a 7/10. 

The other thing is that this mattress curved at the end. Our pillows fall between mattress and frame often, which is sort of annoying.