Pros
Good pay with lot of hours while deployed. Get to travel, if that's what you like. You get to help people in need. It's really only a good job for it you are retired and widowed.
Cons
FEMA is horrible to be involved with under the current administration since 2025. Very unreliable work. They will say one thing to you and then do another, when it comes to supporting you even if you've been a top employee for a decade. If you get terminated, your can't find out why or appeal. You may spend months away from home at a time (so it's awful if you have a family or want one). You may have to stay in gross hotels or on coast guard ship (in some places). You can only rent a economy car so often you may get stuck on back roads or long country drive ways full of mud or flooded and often then have no cell services to get help (due to responding to areas after hurricanes).