For 18 years I was sleeping on down feather mattress toppers, and my most recent one was pretty old so I thought I'll try the memory foam.  This one has some gel to help you stay cool, but right away I noticed I don't feel as cool, much warmer than with the feathers.  I'm a petite woman, 5' 2", 112 lbs if that helps put it into perspective, I don't sink in very deeply into this memory foam, I sink deeper into feathers.  I tried to get used to it for two and a half months, and now I just bought a nice 4" feather topper to use instead.  Looking forward to its arrival!  The memory foam is not as luxurious as feathers.  When I try to sleep on my stomach my back arches and my neck and shoulders are also very uncomfortable.  Feathers are malleable and don't have a memory so it's true you have to plump them the same way you plump a pillow - but it's totally worth it!