I have a tree that is most likely 99% sourced BUT occasionally the only source is the US & International Marriage Records. That source is not a good source. Anyway I have 16 DNA circles and about 430 4th cousins or closer. The DNA circles do work. Ancestry told me I had the same DNA as a group that was kin to someone born in the 1700s. After research I made the connection,so it does work.