This is the second one of these that I've purchased. I wish it came in an 18" W version, but alas I settled for the smaller of the two. I can still use the remaining cabinets space for cutting boards or whatever. It is very easy to assemble and is customizable to fit the pots/pans that you want easy access to. 

Pros: Easy to assemble, customizable
Cons: Doesn't come in an 18" W version