jimstone,
Unless you are a beginner I don't believe the Mother Drills would do you any good. Some on here thought they might be worthwhile. Others on here thought they were - I'll be kind here - less than helpful.
As iusedtoberich said, alot of it is rolling balls down the table. And let me add that when I showed two of the all time greats the Mother Drills they really didn't think much of them.
r/DCP