Turface is a calcined (baked at high temperature until it is ceramic-like) clay product that holds moisture and nutrients very well. The soil in the picture below holds no perched water, yet it still holds good amounts of moisture inside the Turface and bark. The result is a highly aerated soil that is extremely long-lasting and root healthy. It's very forgiving and offers a wide margin for grower error, unlike peat based soils that have inherent problems. I have been growing all my houseplants (succulents and cacti, too) and other long term plantings in this soil for years. Well over 100 people from GW are using and loving it as well. This post is well over a year old, but you can see how people feel about it: http://forums2.gardenweb.com/forums/load/contain/msg11134158... There are many more threads like it at GW.