I think that the answer to your question depends a great deal on what you would do with the information.
For instance,
- Are you a very analytical person who can rationally think about statistics or will you be thrown for a loop by a possibility of a concerning result?
- Would you proceed differently with the pregnancy depending on the result of the test (termination, or any other option)?
- Do you worry about every little thing during pregnancy and would the statistical information provide you solace?
- Would you be interested in doing additional testing if you received a concerning result?
IMHO knowing yourself and how you *personally* will experience this process is the key to your answer.
(FWIW - I did have the quad screen, got some very concerning results and opted to move forward with an amnio. This was the right decision for *me and my family*.)