For the most part I found Ancestry.com DNA to be pretty accurate according to my research. However it totally missed the Native American in my tree. I did upload my dna to gedcom and it found the Native American at 1.5% which is about half of what I thought it to be. This leads me to believe that my Native American ancestor was not full Indian, which is a certain possibility. I have heard of at least 3 other genealogy friends that have documented Indian ancestry which was missed by Ancestry.com. and was picked up by Gedcom.