I listened to a talk by Glen Decker of Piping Rock Orchids just the other night. He doesn't use Orchiata but instead some US sourced bark, I forget exactly what he said. He says that he likes to repot paphs at least once a year and would repot even twice a year if he had the time. He had a Phragmipedium kovachii for sale for only $375 and he was setup for accepting credit cards but I resisted the temptation and bought several paph species instead.