The guys you linked appear reputable.
There was a thread or so recently where 23andme and similar companies fudge their results “to mess with racists”.
Can’t help but wonder how prevalent such behavior is.
http://freerepublic.com/focus/f-bloggers/3612348/posts
I’ve studied my family history extensively. My blood goes back to the stone ages of Sweden. I’ve been curious to try that DNA stuff to see if it’s bogus.
That “mess with racists” article turned out to be one of those admitted fake news sources (as opposed to the fake news sources who won’t admit it).
I waited years to take my DNA test, because I had this fear I’d turn out to be related to the pastrami sandwich I’d had for lunch.