I am amazed at how easy it is to put this unit together. It also is much stronger than I thought it might be. 
The tension in the side rods is tight and I don't have any concerns that it might not hold. The top rod fits together tightly (sides have screws that fit to center rod) so I feel confident that rod will hold together well. 
You don't need any additional tools to put this together.  
I hope to use this unit for displaying quilts and wall hangings at social events.