May want to read up on the Roth 457, and roll it out to a Roth IRA if you can / want to.
Roth 457 is not exempt from taxation if you withdraw prior to 59.5. No 10% penalty, but if you withdraw early, you pay taxes on earnings.
Primary benefit of Roth: don't pay tax on withdrawal
Primary benefit of 457: no-hassle withdrawals penalty-free before 59.5.
You'd think Roth + 457 = no tax on withdrawal, even before 59.5, but you'd think wrong, at least as the law currently sits. Not necessarily a huge deal, but Roth IRA ordering rules would treat you better should you want to get at that money before 59.5 down the road.