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YDNA testing
Way back in 2003 I tested with Ancestry. That was a big mistake. They soon went out of business so the company was no help or use for research. Now that they've started up again I don't trust them. Once burned, twice shy. I won't use them again.
I had my brother tested in 2005, this time with FamilyTreeDNA. I have been very happy with the results, the support, the matching, and the opportunity to obtain more refined tests. I also had a cousin test with FamilyTreeDNA for my mother's father's YDNA.
I tested myself with 23andMe about a year ago and have been happy with the kind of results they test for. It is different than FamilyTreeDNA as they can give you medical information as well as matching opportunities.
My advice it to know what you want, know what you can get, then use the correct testing method to get the desired results.
Linda