I have used three different DNA testing companies trying to get to the root of some family health issues. 23andme gave broad insight into ancestry, traits and a very few specific diseases; it's raw data was not easy to search from its site, but you could upload it into other specific search sites. Ancestry.com gives excellent ancestry info and makes integrating it into genealogy easy. Only sequencing.com found the suspected rare health issues and created reports that were easily accepted and understood by my doctors. While i wouldn't recommend it for genealogy work, sequencing.com is the clear choice for medical and genetic investigations.