Obviously we think Smart Pots are the best, but don't take our word for it. Here are some studies and write-ups for your enjoyment.
Academic Study
Oregon State University study about Root Pruning in Fabric
Containers.
Academic Study
Texas A&M study about the
advantages of Smart Pots vs.
conventional containers.
Academic Study
University of New Hampshire
article about the winter survival of
plants in fabric containers.
Article
Smart Pots in the Wall Street Journal
Article
Smart Pots write-up in National Gardeners Association