I don't have any direct experience with Quarry Lane but I do know it offers an IB Program. We live near Quarry Lane and currently have our kids in the local Dublin public schools (Green Elementary and Dublin High School). As suggested by another respondent, meeting with the principals of Quarry Lane and Valley Christian (another local private school) as well as Dublin High School (the local high public school), is a great way to get to know a school. Another resource is a website I founded with local parents focused on Dublin public education - http://www.OneDublin.org.
Good luck with your decision process.