Top Law Schools

I just received an interview request from Cornell. It says that it's voluntary, and so my questions go as follows:

Is it worth participating? Does it help my application more than it could potentially hurt it? Does it make an actual difference? What type of questions can I expect?

Thanks in advance!

If you have any interest in being admitted to Cornell, you have to take the interview.

Well then, it seems I'm taking the interview! Thanks for the heads up!

I got the sense that Cornell used these interviews to subtly gauge your interest in coming.