I also use Roots Magic. And I hate entering all the data again. So I've been importing small gedcoms about 25 people at a time. The data comes fine, with the connections made nicely. I usually just have to connect one person to "the big tree." The biography is messy. (better since the last update.) But sources come in as a disaster. Everything is repeated three times and I've discovered that roots magic has used the same repository for just about all my sources. The small gedcom is important, so you don't get overwhelmed by the work required anyway.