Pros
You might get lucky and they have a real position to put you into! If they do, you get paid hourly like any other contractor.
Cons
They recruit you using language like a permannet position saying "We have an opportuinty with a Client for a position doing Planning". What they really mean is this - if you are willing to go thru our background check, we will build a profile from your resume to try to create demand to start a project up with this client. We will pay you nothing and you are expected to help win the business you thought we had that we were recruiting you for. Also, their Medical Insurance does not kick in until you have been working there for 60 days! If you are on the bench, you are unemployed period. My career planners warned me about this - I tried it out for myself. It is true. There were more people on the bench (looking for a job anywhere they could find it) but Resources Global still counted them as their resource. The consultant bears all the risk here in this relationship. It is very misleading.