Just did my first DNA genealogy. It did help confirm what I suspected. And those that are looking at the same lines as I had similar DNA, so at least I am on the right track and feel I have the right information. Interesting to do if you have the money to spare.
I just did it for my Cobb line and am thinking about doing it for my Strickland line. There are over 200 participants for the Cobb line. Some of them have proven established lines. It has to be a male with the last name of the one you are testing , so I had a male Cobb cousin swab his cheek. The I submitted them to Relative Genetics and a couple weeks later got the results. There are 5 in the group that have the exact same alleles as mine so we are close cousins within 5 generation. There are 2 others that have the same except for 2 allelles so we have a common ancestor within 11 generations. Then you compare what you absolutely know to be true and proven by documentation. It really helps to either substantiate what you have and give you more informaton or it totally blows you out of the water because you are totally off base.
You are lucky then. I have lines that I think are right and the DNA can help confirm it or throw it out. There are over 200 participants in the Cobb DNA project. It is interesting because some people, who thought they had the right line were totally off base. DNA did not match up at all.