Not as sturdy as I would have thought.  Plan to purchase a few extra L-brackets and 1/2" screws to secure it better.  The hutch secures to the desk via double-sided tape.  Plan on a bracket for that two. Might be a good Idea to just use liquid nails for the trim items.  Really love how the top of the hutch is reinforced with two planks vs on, giving it little to no chance of bowing.