What my DNA testing through Ancestry.com accomplished well was to link me genetically to the families I already have in my tree. Mormon family genealogies are largely to credit for that. (Along with not much foolin' around).
There is one significant name missing. Yep, Vaughn. We need more Vaughn/Vaughan DNA tested! Cousins, Uncles, Aunts, etc., please note! In another section of my Ancestry profile, I have confirmed Vaughan DNA with a distant cousin in Utah County with matching ancestors from Thomas Vaughan (1850) back. So it's there, it's just not well documented yet. We need more testing.
Here is the general genetic confirmation of my Family Tree:
26 DNA CIRCLES
These are people who are already in your family tree (GLVaughn Family Tree)