When does a private student loan refinance actually make sense?

No seriously, when does a private student loan refinance actually make sense?

My credit is way better now than when I originally borrowed, so I’m wondering if that actually makes refinancing worth looking into now. I keep seeing ads and reviews everywhere and honestly it’s hard to tell what’s useful and what’s just someone trying to sell a loan.

For people who have done a student loan refinance, what actually made you decide it was worth it?