I am giving this a top number because it is sooo sturdy. I was concerned the metal would make weird noises but the process of tie down is excellent. Also I was concerned an adult would have trouble getting out of the lower bunk but I am 66 and did just fine. The only negative is the instruction manual had a mistake which cost me a week waiting. The company finally emailed me back the manual was wrong and I did not need a replacement part. Cannot wait till my grandkids get here for the surprise.