DH and I were considering a ROP policy a few months ago. I have the advantage of working for a major insurance provider, so I asked someone in my building to give me some no-nonsense information about the pros/cons. Here are the sites she sent me to:
ROP site 1.
ROP site 2.
Nothing a Google search won't pop up for you, but it was some peace of mind to me to know that some of the top pros in the business recommended the sites as good guides to determine if ROP was right for us.