We’ve mentioned this before, but it bears repeating:
DNA tests for genealogical research have been heavily marketed. There are times when they will solve problems–or at least help to solve a problem. But DNA needs to be used in concert with other forms of documentation that researchers have been using for years.
And DNA will not necessarily make your genealogical research easy. It will give you one more tool in your research toolbox.
But it is not the only tool.