I was a member several years ago when I needed access to some data for a research project, and I ended up tracking down quite a bit on my own family besides. Turns out my 6X-great grandmother was hung for witchcraft in Salem in 1692. Three cheers for That Old Time Religon.
At the time I was a member, close to 20 years ago, Ancestry was about the only place you could find a lot of the information offered. It was worth the price then, but I don't know if it would be now.
My mother signed up for one of those DNA deals, and it turns out we're part Yakut. Siberia's lovely country I hear.