I dont know man, bubble hash seems to be the preffered method among conniseurs. IIts in my grow books my cannabible, My IC mag did an extensive article on making Bubble in the jamaican jungle and it came with a dvD that was all about making bubble hash. I never saw the dvd though. But everyone talks about bubble. Theres even a forum I think its call fullmeltbubble.org or something but its all about bubble hash and making it and smoking what some say is the finest hash in the world. No what I mean? I dont see ISO getting all that attention, but I know very little about it and have never had it myself being that I have a honey oil extractor and bubblebags.