Wonderful!  This topper has transformed my tired mattress and improved my quality of sleep from the very first night.  Speedy delivery and once left to expand from being vacuum packed in line with the enclosed instructions (24hrs) it has been like sleeping on a cloud.  I have back and neck problems and have never slept so comfortably.  The topper is supportive without feeling too firm.  It's perfect for me and exactly what I was hoping for.