Love this! We ordered 2 sets, yellow and green and mounted them alternately for more of wow factor. Emptied a whole cabinet by putting pots and pans on the wall and it looks wonderful! Received my order in 2 days too!
I was hesitant to put cast iron on there but, went with it and it is holding tight to the wall. 
Used every hook that came with the system and ordered more.
My only complaint is that the yellow panels both have minor cracks on 1 corner each. Debated returning them but, was too eager to get them mounted. 
also ordered plugs for the holes to give the system a more finished look.