I love this bed, I have been looking for a frame that does not squeak or shake. When we first put it together, we used a box spring in addition to the mattress, and the bed did shake back and forth. However, when we removed the box spring and placed the memory foam mattress directly on top of the slats, the bed is sturdy as a rock. We did have the same problem as another reviewer, where the pre-drilled hole in one support slat did not align correctly with the hole in the frame. However, the screws that hold the four frame pieces together have some horizontal leeway, and so we were able to unscrew the front frame piece from one of the side frame pieces, push the side frame piece inward, and then the misaligned hole was able to be screwed in. For this reason, I recommend only loosely assembling the four frame pieces before screwing in the slats, so you can easily adjust the frame once the slats are in place.