Yes. We did the Ancestry.com DNA test for my Father In Law as a Christmas Gift. He had a friend do it and he became interested in doing it...mentioned it this fall. I made a mental note for Xmas. He has known he's Swiss and Hungarian but the rest he did not know. So we sent it in.
While it's been processing I've built a family tree (free on the site). It's very interesting and a bit time consuming. I can see why people get into it though. But I have too many irons in the fire to sign up for more advanced searches (which cost $ -- monthly membership) and just the investment of time alone. Over Christmas I had some time off to build up a family tree...but then it sort of dead-ends off after U.S. Census's run out. Advanced searches get you foreign paperwork as well.
But then I'm thinking I don't know how to read German or Norwegian...so I'm done.