Who has experience of this???
I submitted one of these, simply because my father (parents both dead and everyone clammed up) was born to a single mother and I never found out who his father was. His mother, my grandmother, married someone else and had more children and my father was brought up by an aunt and uncle (now also deceased). So there is a whole quarter of my family tree missing.
I've not received my results yet but this morning I got a message "Hi Cuz!" from a guy named Dave in Indiana, so my results must be available and he will have been alerted.
I have had a quick look at his tree and the only British people I see are from the 1600s who then emigrate to the USA from Yorkshire (think Pilgrim Fathers time). The family history I have researched from my maternal grandparents and paternal grandmother going backwards to the 15th and 16th centuries all relate to Lincolnshire, Middlesex and Ireland, so am I right in assuming that these English people could be ancestors or relatives of my unknown real grandfather?
Of course much more work will have to be done, but initial thoughts very welcome!