Yes, I have several bonsai, some 20 years in sphagnum moss. Do not pay much attention to that guy, he's left out a lot and his bonsai knowledge seems lacking to me.
I learned from the late Brian Batchelder, and still have his book. It can be found used at amazon or other places if you search. using sphagnum instead of soil requires daily (or more) watering, but many trees do better than in normal grit soil, especially if they like acidic soil or have a shortage of feeder roots when potted.
Oh, and Batchelder died from sporotrichosis, a disease that infects the lungs from inhalation of spores, and through the skin when the person handling it wet has an open cut. That guy on the video is asking for trouble, I always wear gloves now when handling it.
http://www.amazon.com/New-Horizons-...r/dp/B0019CEZMC
Mcspeed,
Yes, they stand up very well, because the roots are allowed to circle the pot. Root pruning is done with a saw. Air gets to the roots better than with grit because the moss retains moisture within it's cells, but water runs right through and out the bottom, so lots of air is drawn between the strands. Batchelder was in Florida too and developed this when traditional
methods often failed in his climate.