Ancestry.com has fabulous data, but the web interface is terrible and the customer service is non-existent. Firefox is totally incompatible, despite their claims to the contrary, and no one ever answers an email, ever. Their customer service hours are geared towards people on the east coast, and even they had better not have a day job if they want any technical support. It is impossible to get through on a Saturday, so forget that. I hear lots of rumors that it is impossible to cancel, too, and that better not be true, because that is just what I am about to do.