Easy assembly.
This bed is sturdy and space saving to say the least. 
Bought this for my daughter and two granddaughters. We use the shelves as a bookshelf which eliminated an extra piece of furniture, the trundle is concealed, and the top bunk is a bonus space saver. I can sleep four for the price of one! LOVE it. We have moved since constructing the bed and it was a VERY easy move. It separates into three part - the top bunk and bottom bunk are separated with rods and the stairs/bookshelf are separated with four screws. Excellent choice.