Paver stones just don't last. There are members of our neighborhood association who are in favor of installing them. However, after seeing the kajillion dollars worth of pavers that were installed in our town in GA fail in just one year, I'm against them (and for other reasons as well). Problem? In our town it's the root growth of trees and bushes that makes them pop, as well as heavy rainstorms. Even laying them on concrete doesn't work because a heavy rainstorm will undermine the ground underneath the concrete, cause cracks in the concrete, and mess up the pavers.
Personally I like the old Florida look of the unpaved roads with oyster shells, although I know many of you disagree with me.