We received two of these for Christmas and love them!  They are hung on a kitchen wall--and hold 36 spice bottles.  Metal design is sturdy and attractive.  Definitely will be easier to find spices than before--a pull out rack in the cupboard which required kneeling on the floor! 

Pros: holds 18 spice bottles per unit. Design is attractive and made of sturdy metal.
Cons: The wall anchors didn't have holes for the screws so we had to drill them in. Also, quite tiny so can easily fall through the drilled wall hall. Screw in with care.