How realistic are DNA test? I'm thinking of taking one,

>>139378066
They collect samples from local populations (presumably genetically distinct) and examine your sample for matches. In the breakdown, it appears as a percentage of how much you have in common with a "native". Overall, your makeup is displayed as a pie chart and a regional map with highlights. Yes it can be vague and unhelpful, but most people use the service to find relatives and biological parents, which is accurate. As for bluepilled stuff, I only ever saw that deployed to cover their ass when giving you your results, saying something like how people migrate a lot so any population is technically mixed. Bottom line OP, prepare to be disappointed even though you might get what you want. That means if 100 is something you're not comfortable with spending, wait until it is. Also look into ancestry.com's competition, 23andme.