I bought this for my 11 year old son. He put it together himself with my supervision and help. It took a while longer, but it feels more like his that way. 
It is constructed of metal, (steel) and seems pretty secure. I chose it also because it said it would support 300 lbs., so my 70 lb. boy has years of use with it. 
There is enough room underneath the mattress for his tallboy dresser and his small desk with an office chair. 
I added some thin, velvet striped drapes underneath the front on shower rings, and it is his own private space. 
I liked that there was two opposite side ladders instead of one on the long side. I LOVED that there are bars all around, (no open spaces), so that I am not as afraid that he will fall out of the bed while sleeping. 
I did have to buy a new, smaller memory foam mattress from way fair and a cut piece of plywood from Home Depot to use as a base under the mattress, but he really loves his space now. It makes a  very small room feel so much bigger.