Initially, I was unsure if this racking would be strong enough for the job I had in mind. I was concerned about the thickness of both the metal frame and the MDF shelves.  I needn't have worried!  
I am delighted with the robustness of the assembled shelving and, as you can see from the photograph, it does a fantastic job of keeping my tools and equipment neatly stored and easily accessible.  It has transformed my small, self built, shed from chaos (I could never find what I was looking for) to an orderly workshop. I am delighted.  
I would have given five stars but it was tricky to assemble because some of the slots were too tight to accept the metal inserts; also I was working alone. Overall, I am really pleased that I opted for the Von Haus 5 tier metal racking.