Really love this mattress so far. I had previously owned a regular memory foam mattress and often woke up hot due to the insulation. The gel memory foam is a game changer for hot-sleepers -- I've been sleeping on this for 2 weeks now and haven't woken up in a sweat or from being uncomfortably hot. The mattress expanded to just under 10" after two days of laying out but otherwise still a great purchase. Very happy!