After contending with the gnats in MG potting mix last year I refused to buy it again although the figs seemed to like it. This year I got some Fafard potting soil Professional Quality. Components are: Peat humas, sand, Canadian Sphagnum Peat Moss and Perlite, and a wetting agent. My brother got it for me at a local Nursery and I didn't check the components. Using this to pot heavely rooted cuttings either in clear cups or regular pots has been a disaster for me. It is too wet. I placed some in a shallow bin in the warm house in an attempt to dry it out. After 3 days it is still wet. After a week the moss starts to dry slightly and you you can actually pick it out. The cups were filled with roots only to rot in the wet moss. I tried getting the figs out of the cups to save it  but the wet weight pulled of the still live roots tangled in the moss along with a handfull of dead roots. This cost me quite a few well leafed and rooted plants. I'll have to start over now with something else. You can be sure I'll check the components in the future.

PS - if it wasn't clear, I also mix in an additional 40%-50% chunky perlite with my Fafard 3B (before watering!).  This makes it even more impossible to overwater.  It also adds more pockets of air, and makes the water run right through.