If these guys tell you the sun rises in the east, get it in writing and wake up early. That is how much you should trust anything they say. I can say they did get me a decent job with good people and I learned a lot from it. Nothing wrong with the client that I worked for but do not trust their recruiters or account managers without it being on paper or in email.
Ive been called in to meet a number of times, but never offered an interview with a client. I try to call the recruiters to follow up and theyre never available to answer their phones or return voicemails.