We ordered 2 of these, the first one wasn’t too bad but the second one we had to modify quite a bit in order for it to feel stable.  The holes were bigger than the screws so the screws didn’t tighten, and that happened on the support wall on the ladder side of the bed (it wobbles when you touch it, and is the side that is supposed to prevent the user from falling out), as well as the support beams that run the length of the bed underneath.  Also just a side note, my kids have foam mattresses so we have to put down another piece of wood on top of the slats under the mattresses because otherwise the ends of the mattresses will fall through between the slat and the frame (happened to my son’s foot last night), and the slats themselves were bowing once my son got into bed (he’s only 6 and weighs 40 lbs, so nowhere near the weight limit).