Pros
Unlike many other reviews I've read, I had great interactions with management. I like the openness of the pay scale, everyone knows what they'll be making when they apply for the job. Benefits are good, although they have been greatly reduced in the last few years due to budget cuts. You start off as a seasonal employee working usually from Dec or Jan until end of June (this could vary from year to year based on business needs), and while you are furloughed you can collect unemployment (in my state, at least), and it gives you a chance to think about pros and cons and look for other employment and try to get out of there. This is a good way to get your foot in the door of the federal govt, you are able to transfer to other federal jobs that may not be available to the general public.
Cons
Many others have written about being shackled to their desk; this is par for the course in any call center. Morale is very low right now due to budget cuts, work loads, stress, and all the issues in the news over the last few months related to the IRS. This is probably going to get even worse once Obamacare starts. If you are trying to become a permanent year-round employee rather than a seasonal, it could take as long as 5 or 6 or 7 years to be offered that opportunity. While the pay is decent, we have lost pay due to sequestration and no COLAs in the past 3 years. And, training is deplorable.