I have no experience with it, but I can say that the yield of pure substance will be smaller when reXtalization is done; the overall yield stays almost the same (almost always some small mechanical losses will occur). But after a recrystallization, you have a smaller than original amount of clean MDMA.HCl and a small portion of impure MDMA.HCl, dirtier than before. But you can always recrystallize this small crappy amount again, and then again... until it isn't worth the work and solvents anymore.
indole_amine