Extremely sturdy.  Took me about 5-6 hours to casually build (as I was cleaning and doing other stuff too).  The piece is well made and uses long, heavy screws.  Really this is overbuilt for what it is (it's still a flat pack TV stand, after all.)  Instructions were clear and easy to follow.  

The hardest part about anything is getting the doors straight and this is no exception.  Soft close hinges are nice but sometimes can be a pain to align correctly.