This bed is SOLID. I have a Casper mattress and the flat slats are perfect. This bed is well thought out with corner squares to keep the bed from shifting. This was my replacement bed to fix an issue with another discontinued bed and it was the right choice. Thanks Wayfair for the help and kindness in this process. This bed will last a long time. FYI - the grey is a warm grey tone if anyone is wondering but the fabric is nice and textural and has a mid century modern vibe.