This took SIX people to assemble.  The instructions are fine, but it does take a LOT of patience.
I purchased this because I read a review that a mom had two teen boys in it.  My 13 year old daughter - maybe 110lbs tried to climb the ladder and it was pretty shaky.  And I'm telling you, we tightened every screw as tight as they would go.  We are going to try putting it on a rug.