Although there are several benefits to using job recruiters, there are also a few downsides.
1. You are not the only jobseeker that an individual headhunter is working with. If you are not the cream of the crop, then your resume may be put on the bottom of the pile.
2. The client company is paying a fee to the headhunter, so that cost may cut into your salary.
3. Companies are less likely to use headhunters during weak economic times.
Remember though, that a headhunter will get a commission if you get hired, so it is in their best interest to get you hired. This is why you should not solely depend on a headhunter, but they are not a bad resource to leverage if you can.