My biggest issue with S/H was operator error. I was not keeping the plants wet enough at the top of the plant, so all the new roots would grow from the bottom. While this was not a problem with something like my besseae, which had a lot of roots to begin with, seedlings that I transfered when not in active growth, or plants (generally paphs) that I did not keep wet enough on top did not grow new roots from the base of the plant downwards. This led to some wobbling in the pots and with the seedlings it was disastrous.