I have been following this thread as I am very interested in the overall response. Funds are very limited and i'm trying to save up for an mtDNA test but I want to make sure its worth it. I haven't been able to add to my tree for months because i'm looking for sources and I've hit brick walls on my mother's side. I could use some community advice: Is it worth the mtDNA test to help break these walls? From uploading my autosomal DNA into GedMatch, DNA Portal, My True Ancestry, and other dna analyzing sites, I have narrowed down my ethnicity to Italian, Southern Italian and Greek (Sicilian), Iberian, Balkan and Central European. When I use GedMatch and DNA Portal, for example, it narrows down my ethnicity further to small percentage Sephardic/Askenazi Jewish. And, If you look at my Sicilian surnames such as Amato, Catalano, Sberna, and Rubbino to name some, I could be but can't verify with my brick walls. so my dear friends, any suggestions or advice?