These boxes are the best!  Especially if you don't have to put them on a railing on brackets that don't fit right.  

They look like real wood, they are reasonably priced and they last forever.  I wish they came in more colors.

One nit:  the self watering makes plants rot in extended periods of rain.  Better to put drainage holes in the bottom like any old pot.  

I am a landscaper in Chicago who does lots of seasonal containers.