I incorporated these planters (I bought 4) down 2 sides of my deck for safety reasons - the deck is only 18 inches from the ground but I thought it would be a good visual so that no one would step off by accident. I've filled them with perennial grasses and small shrubs, they are beautiful!

Pros: solid planters with sufficient drainage. Narrow enough so they don't take up a lot of deck floor space but wide enough to accomodate an array of plants. 
Cons: none