Thanks tboyer...
I don't plan to include federal loans on this refinancing.
I'm looking to do exactly what you said--lower the interest rate and get it fixed. Although a side effect may be a lower monthly payment, I plan to pay what I'm paying now to pay it off early.
Glad to hear it's reputable--I've done a lot of research on SoFi and other options. They seem to have the lowest (fixed) rates of all the places I've seen. I'd like to get this wrapped up, one way or another, before the Fed raises rates.