Hi,
I myself used only chanca piedra (it supposedly crushes stones), since it was my second flush I did not have anything to compare it to, just that I got out more stones than the 1-st time, which is not saying much. BTW, that's were I bought it: http://www.rainforestpharmacy.net/prods/chanca-piedra-full.htm.
I found some info on CZ://www.curezone.org/forums/m.asp?f=80&i=1991. Read other posts in this thread - interesting.