To reiterate one of the points Melanie made: FTDNA says I'm 77% British Isles, 20% East Europe, 1% Scandinavian, and 2% other. MyHeritage, using the exact same DNA data, says I am 42% Scandinavian, 32% East European, 22% Irish/Scottish/Welsh, and 4% other. And ancestry.com says I'm 43% England/Wales, 31% Germanic Europe, 11% Norway, 8% Baltics, 4% Ireland/Scotland, and 3% Eastern Europe. So I'm anywhere between 11% and 32% East European, 22% and 77% British Isles, 1% and 42% Scandinavian, and 0% and 31% German. Based on paper trails, I am actually roughly 45% German, 15% Lithuanian/Polish, and 40% British (with a bit of Huguenot French thrown in). So, all in all I find the ethnicity estimates to be useless for genealogical purposes.