Revisiting because I jumped on the 23 & Me bandwagon earlier this year. Ancestry DNA, too. My adoption records are bereft of biological parents' adult medical info and familial medical issues so I figured it was worth a shot for that info alone.
Really cool to see the ancestry and genealogy stuff. Confirmed what I presumed due to my green eyes, stocky build, and pale skin... heaping helpings of Scottish and Irish, a dollop of German, and a sprinkling of English and French. Best news was an almost complete lack of genetic markers for really bad medical stuff.
On the adoption side, well... DNA matches got solid hits on an aunt and two first cousins. What's really scary, like seriously scary, is how easy it was to track them down. With only three pieces of info, an hour on Google, and cross-referencing genealogy sites with news postings, obituaries, and social media, I had an entire family tree of all my paternal aunts/uncles (including spouses and home addresses for all, phone numbers for most), paternal grandparents, several cousins, and a half brother. I was able to narrow down my bio father with an extremely high probability, including a current job description, professional bio, and LinkedIn profile. Impressive one, too. MBA from a place that for sure makes you earn it. Founding president and CEO of a large national bank. Board of Directors for another large regional bank. Still alive and lives in Nevada.
Nothing on the maternal side, at least nothing which made me go "Hey, that would be easy to track down". No desire to start digging through DNA hits to try and build a tree.
I stopped there because it had quickly progressed wayyy beyond my scope of curiosity and was getting creepy. One cousin tried to initiate contact but I didn't respond.
Brad