A review for Casper mattress ownersI bought this frame to serve as the base for my brand new king size Casper mattress. The box spring kit arrived a few days before my mattress, allowing me a little time to do some research on the best foundation to use for a Casper mattress. According to Casper's official documentation:"The best option is a slatted base frame (with slats no more than three inches apart) or a firm platform. With metal frames, you want to make sure that the base has unyielding wooden slats that are thick enough to support the bed."Based on this information I started to panic a little bit. When assembled, this frame has SIGNIFICANT gaps between the metal support rods, and definitely would not meet the 3 inch gaps recommended by Casper (in some spots there are big squares of space). I decided to go to a few mattress stores in town to look into a more traditional wood box spring, and found that every box spring in stock seemed to all have slats that had much more than 3 inches between them. After some consideration, I decided I would assemble the frame and if it felt sturdy enough I would go buy some lumber from the local hardware store and make my own wooden platform on top of the frame with 3 inch gaps. I decided to place the boards perpendicular to the metal supports in order to provide the most stable support possible. I purchased 6 1x10 inch boards for about $37 and had the hardware store cut them to 78 3/4". While at the hardware store I also looked around for some way to secure the boards to the frame to keep the boards from moving around. I ended up purchasing Velcro with adhesive and affixed one end of the Velcro to the cover of the metal frame and the other to the underside of the boards. I am really happy with how this DIY solution ended up working out, and now I don't have to worry about damage to the integrity of the mattress overtime or sagging (see my pictures for a better idea of what I did). Alternatively you could use plywood, but I liked the portability of the lumber as opposed to one giant piece of plywood.Assembling the frame:I admit after reading some of the reviews I was worried about the difficulty in assembling the frame. It turned out to be really easy. There are no written instructions, but the pictures were more than enough to get it assembled correctly on the first try. I assembled the metal frame myself with no additional tools in about an hour. I did have help lifting the frame in order to zip the cover on, but I am fairly confident I could have done that myself if I had to, but I would recommend having two people to do this to make sure you don’t tear the cover.Sturdiness:The fully assembled box spring seems really sturdy. It does not creak or rattle or seem to move at all under the mattress. I have slept on the fully assembled frame with a mattress and the lumber supports for several weeks now and have been very pleased with the overall sturdiness of this box spring.Headboard mounts:I purchased the box spring with the headboard mounts, but unfortunately the holes in the mount do not line up with the holes in the supports of the headboard, and the frame is narrower than the headboard legs. I will likely mount the headboard directly to the wall "hotel style". Don't plan on using the included headboard mounts to fit a king size headboard without modification.Feet/height:I purchased the model that has 9 little plastic legs that screw into the frame after you put the cover on. There are little sewn holes in the cover where you screw the feet in and were lined up perfectly to do this on the first try. The overall height of the frame and mattress, even with the feet was significantly lower than our previous queen bed set, so I ended up purchasing 3 inch risers to raise the bed to a more acceptable height.Final Thoughts:-I wish the frame was taller. The new bed seems to be much lower to the ground than my previous mattress and box spring.-We bought the 'standing box spring' version, so it came with little plastic feet/legs that screw into the bottom of the bossing over the cover. The legs are sturdy, and there's 9 in total.-Overall I am happy with this purchase, and think this was the better option when compared to a traditional king box spring. It will be much easier to take apart and move, for sure.