I've made mine at FamilyTreeDNA, since that's the place most Swedish genealogists use. Might be good to know if you have Swedish ancestry, you're most likely to get matches there. I've allso uploaded my information to MyHeritage when they let FTDNA customers upload their data for free a couple of years ago. Also, I've uploaded to GedMatch.
No surprises, but one great break-through for my genealogy research. My father's father's father was unknown. Grandpa was born out of wedlock, and never knew who his father was. He had one he suspected to be his father, a man who emigrated to America just before grandpa was born, but he was wrong. My dad was thinking it was a man who lived here in our home town, based on the fact that he looked very much like my grandpa. With the help of DNA, I now know it's this local man who is the father. I've matched with several relatives to him.
Sad really to think, they lived so close, but he never acknowledge that he was the father. The man lived til 1969, I could have met him, even though I was only 2 years old when he passed. My uncle, who helped me by providing his DNA to narrow the search, was really annoyed. His best friend when he was a little boy, now turned out to be his cousin. He was in his teens when his grand father died, he could really have had a meaningful relationship with him. They shared the love of music, both being very accomplished musicians. But, it's easy to sit here today, and judge him. Maybe it wasn't that easy. According to my dad, his grandmother was an evil woman, maybe she didn't let the father have any contact with his son? Anyway, now we know. Fun thing - thanks to this, I know that one of my closest friends are a distant cousin.