We bought the king size mattress and at 3 weeks in the mattress is still too firm. My husband and I have been waking up with sore backs, hips and shoulders. I'm hoping that it softens up soon because if not we will have to return the mattress.
I had it for a week and it is very supporting and comfortable. It took me the first night to get use to it. After that , I have been getting a great night sleep. With my old mattress I use to get up several times at night due getting my arms numb. That is no longer an issue and I am sleeping through the night. So far so good.
I let the bed completely form for about three days before sleeping on it. The frame had a few pieces that were slightly bent but overall fairly easy to assemble. The pillows were a big surprise. We love everything we purchased.
Our last mattress suffered from sag after only three or so years, so we tried this.. took a few weeks to adjust to its relative firmness and I've still got to find an appropriate pillow because with this mattress my shoulders don't sink in as far as they used to. Seems to be a keeper, though! Wife likes it so.... happy wife; happy life!