It is very intriguing. I have several friends who have done it. One friend has a Native American grandmother but her test came back 0% Native American, but the NA database is very, very small, so we all expect this to change over time as more people participate in the testing. Another who was adopted at birth, he knows his birth mother but not his birth father. He did the test and found who his father is. My husband is one-quarter African American, his sister's test came back 16% African. I'm learning some fascinating stuff about DNA!