What I've been doing so far with my test results is supporting my paper trail trees with DNA evidence. I haven't broken down any brickwalls yet, but I'm finding some evidence which may do that in the future.
Having worked with the Autosomal DNA tests since 2012 I've formed some opinions about the different companies I've had experience using.
Here are my grades based on my experience:
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Since the point of testing for me is to confirm relationships my overall scores reflect the tools provided by the companies to do this. Some explanation of my scores:
Family Tree DNA: B Overall. Because they have good tools. If they used phasing they would get an A- overall. They need to improve their family tree interface and ethnicity predictions.
AncestryDNA: C Overall. They would get an A if they had tools for confirmation of relationships. The trees here can be so horrible which creates a problem. Some are great, but others just make me crazy. They do have a new tool called Circles which is mainly a novelty. They provide good matches; which, unfortunately need confirming elsewhere.
23andMe: C Overall. This grade reflects the low query response rate, and the low level of family knowledge of the database matches.
I looked at this review of AncestryDNA yesterday and it inspired me to grade the companies: My AncestryDNA Review: A Cautionary Tale. Interesting post.
The International Society of Genetic Genealogy has a great page comparing the DNA testing companies.