Last August my sister-in-law gave me a DNA test kit from 23and me. I was so excited because I had always wanted to do a test but hadn't been able to get one so I am very grateful to her for her generous gift. Ironically, this was the same test my brother used so we were able to compare results.
My DNA breakdown is as follows:
Maternal Haplogroup: H Paternal Haplogroup (From my brother's DNA): I-M223
(My brother's maternal haplogroup is H1).
DNA tests are only as reliable as the algorithms used. 23andme has updated my results two times since I took the test. I had first showed to only be 99.9% European with 0.1% North African. The first time my test was updated it showed I was 100% European, the second update added Scandinavian, which includes the Vikings. My brother has continuously showed to be 99.9% European with 0.1% Sub-Saharan African.
To see how accurate the DNA results were, I decided to chart each surname in my ancestry to see how the DNA results compared with the documentation I have gathered. I have been able to trace most of the surnames in my family tree far enough back to their European roots with just a few surnames left unknown. Not too surprisingly, the paper trail matches with the DNA results.
I am still researching every line, obtaining more documentation and finding even more surnames associated with my family. There is family folklore of having Native American DNA that has not shown in my DNA that I am trying to prove through a paper trail. I have also obtained a clue as to which line of the family the African (either sub-Saharan or North African) DNA comes from.
DNA is a great tool to have but I always obtain as much documentation as possible...the paper trail will prove the DNA.