After you connect fifty or so devices, it becomes more difficult to manage. You need to stay on top of node status.
I manage a wifi mesh using a tool by open-mesh called cloudtrax (www.cloudtrax.com). It has a cool interface that you place each node on a map and it shows how it fits into the mesh including signal strength.
It would be nice if SmartThings could create a similar layout of the zigbee and z-wave mesh.