I don't think anyone will have an answer because noone knows what kind of stones they have.
I can tell you,if you know you have calcified stones like me, seen on an ultrasound, that so far I have used many different softeners and in 3 1/2 years the stone is still the same size.
One person, who did not want to do a flush, used GCG for more than 6 months and ended up doing surgery since there were no changes in the stone.
Here is a link from Webmaster about different softeners //www.curezone.org/forums/m.asp?f=73&i=462