Depending on your program, you may not be able to take advantage of paid leave without relief. Many times you may be coming in sick or skipping vacation because no one else can or will work for you.
Lots of paid time off.
The health insurance for full-time employees is good especially if you are a single person with no dependents--in which case you pay relatively little per month and the agency pays a large chunk of it. If you have children or a partner the cost goes up pretty quickly, and if you are below full-time it is also more expensive. Vacation, sick-time, and the 401k were all alright. The union has done a good job negotiating benefits overall.
List based on reports from current and former employees. It may not be complete.