The CA King mattress is so comfortable for my wife and I as side sleepers. It is a memory foam but still on the firm side. We live in Los Angeles and it only took a few days for delivery. Was also very easy to assemble.
Using on a platform bed: Nice support for an array of sleeping positions; no bounce, no jiggle, no shift when moving; good edges.Easy to unwrap; negligible odor if any.(Not a cure for arthritis, so consider an adjustable bed.)