I ordered these beds for my senior dog Sophia with arthritis and her 'sister' and am very happy with our purchase! As soon as I got the first one put together, Sophia was ready to dive on. It plumped up much faster than the 72 hours they quoted, being ready to go in just a few hours, although she was not having any part of waiting. lol She LOVES her new bed! For size reference, Sophia is a very muscular 55 pound Bully girl, and her 'sister' Tazz is around 35 pounds and all legs, slight build, and quite tall, and this bed is the perfect size for her to stretch out completely.
The egg crate base is firm, about 2" thick, and molds to the shape of my girls, offering great support. The cover is velvety soft and inviting. The instructions say to put the memory foam on the bottom under the egg crate foam, but due to Sophia's arthritis, and being a memory foam mattress user myself, decided to put the memory foam layer on the top so she lays directly on that with the egg crate being the base. Works great, and makes for a supportive night's sleep. She seems to feel less stiff now on waking up.
I also washed the covers as they were pretty dusty, and they are easy to wash, and come out nice and fluffy, although will not know about durability until they've gone through a couple seasons. My only complaint is that the bumpers are not removable, so go through the wash cycle as well, but dry really fast and retain the original shape nicely, so all good. Overall, my dogs and I are very pleased with these beds!