Not only did I buy the brackets, I bought the window box to add a classy curb appeal.  It certainly did the trick!  The front of my house looks spectacular with this window box and it's visible at night with either a solar spotlight or cabled electrical spotlight.  My  house really looks nice when it's dark out, but with the landscape lighting shinning on it, it looks even better for everyone to see the pretty flowers I planted in the box.  Please search for a YouTube video on installing this.  It will help you greatly. 

Pros: Durable  -  pricey, yes, but you get what you pay for - quality. 
Cons: NONE!