This bed is the most comfortable bed my wife and I have ever slept on! What a wonderful change after 27 years of sleeping on a water bed. This California king fits our water bed frame perfectly and sits about one inch higher than the sides. The bed did expand to 10 inches and did not have any adverse chemical odors as some have noted in their review of other beds. The bed does sleep noticeably warmer than our water bed but the comfort trade off is well worth it! I most also note that I had purchased the 8" version of this same bed and was very disappointed as it had only expanded to 6 - 7 inches and was too thin. The customer service folks at Overstock went far and above my expectations and took care of this issue. Overall I give this bed and easy 5 stars, this paired up with great customer service means that I would have no reservations making a purchase recommendation to friends and family! Peace!