To be fair, this is the second day, and we haven't really used it. I put it together myself, which is a feat in itself. I feel confident that each colored shelf in itself is sturdy, but the only thing holding all three shelves together is the puzzle pieces. I'm a little concerned that if my rambunctious five-year-old gets crazy with or on it, it will fall over and come apart. So I feel like I can't leave him alone with it. If we weren't in a rent house, I would drill it to the wall for security. I guess another option would be to glue the puzzle pieces together . Other than that, I appreciate the seemingly fine quality with which each piece is made. Hopefully this will hold up for a year - that's our goal.