Love this mattress for our King split platform! We've been sleeping soundly through the night since the very first night. It did seem a bit firmer compared to the showroom model, but our sales person said it would take awhile before it was broken in. But we slept right through the night at first and so how can we complain? We chose this series because of the hybrid combinations--mattress coils, foam and especially the cooling gel. We live in Texas and although we have air conditioning we do get hot as we sleep through the night. We are looking forward to the summer months to experience the difference and are expecting to be quite pleased. I had done a lot of research and hybrid seemed the way to go for best results.