Does anyone have a 457B? My new job offers a pension, but a 457B is offered for anything beyond that.

I also have a Roth IRA that I've invested in for years, so I'm wondering what I'm going to utilize as a strategy here. I’m curious if I should attack this new 457B option, or just stick to the rough. I am pretty excited to have a pension, though, although I won’t be able to qualify until there for five years at least.