Vantaggi
They may get you employment - if you have marketable skills. And while I can't speak for every recruiter, the recruiters I worked with did not ask me to misrepresent my skillset on my resume (other contracting agencies did.)
Svantaggi
KForce is either utterly horrid at communication/making sure all their employees are on the same page, or they're just like any other contracting agency out there: they will say whatever is necessary to get the contract and then leave the contractors and hiring managers to handle things themselves. All the while collecting at least a 60% markup, probably closer to 85%. The recruiters play fast and loose with the truth. They frequently represent longer-term contract opportunities as being contract-to-hire...but ask in the interview if you get that far, and you'll probably find that the client-company has a hiring freeze going on. The KForce people also often tell contractors one thing, and hiring managers another. They do this frequently. KForce seems to have problems onboarding people - ie, getting the paperwork scheduled, then processed. They don't leave enough time to get things done properly, and then - of course - they make copious errors. Woe to you if they have to run a background check on you. You can enter all the information absolutely correctly, and the third-party system they use will still find a way to maul the process. Employees are not able to quickly or easily access online info about benefits, pay stubs, or even the current KForce employee handbook. Never mind what their site says about what their employee portal can do, it lets employees enter their timecards and that's it. KForce doesn't return consultant's calls or emails in a timely fashion. They also quite often seem unable to follow up with clients/hiring managers unless there's a major firedrill.