I spent a little time exploring Rollyo and can't say I was impressed. I have not felt the need to pare down the search engines I use. I could see some potential in the classroom: a teacher could set up specifics sites to search in a particular subject, for example. As for the Library, I want to broaden my search capabilities, not narrow them down to particular areas.
I went to the CSLA site to see how others liked this tool and found similar results. The best part of that was reading the blogs of others who are in the process of doing this course! ('Misery loves company'?)