I have been using MZ12x, and unlike another post about solvents, I find info tainted to butane as being safer, which I do not understand as per the hazards, like blowing your self up. From the literature I have read, DME is safer and purges in less time and is not harmful to the ozone layer as butane is. i have been getting the same results and have not got a wax or crumble, but if i understand strains OG kush has a been know to wax up. I have been getting much better results, 6 oz of northern lights yield 17 grams, Chernobyl 1 oz yielded 8 grams. Never got that with butane.