I found this thread while googling to see what kind of feedback there was on line regarding Weatherby's honesty.
I worked with a couple of locum agencies about ten years ago, and have recently been in touch (a lot) with several, trying to line up the right job.
I seem to have a good commitment from Weatherby, and am working with them pretty much exclusively toward this position which begins in a few weeks, and here is my experience so far:
I have found Weatherby's agent to be exceptionally friendly and talkative (about his family, his vacation, my family, etc.), to the point where he seems to waste a lot of his and my time on unnecessary communication, and where he's got a bit of a "used car salesman" feel. There have been days where he's called me four or five times, and during a period of almost a month, there was almost no day when he did not call me. So, he's a nice guy... I guess...
As our discussions progressed, I realized that, unlike most of the other recruiters I dealt with, the Weatherby guy seemed to conduct almost all of his business by phone, with almost nothing by e-mail, ie: nothing in writing. At various times, details that he had explicitly told me would be one way ("Yeah, we'll definitely pay for that"), when it came down to brass tacks became, "Oh, we can't pay for that." In each case, when I pushed back hard, suddenly, the next day, he had permission to give me what he had already promised me. At times, he appeared to make a mistake because he didn't know how something was done, but when I asked, he said he'd been working for them for "many years." The mistakes tended to be things that, if they went the "mistaken" way, would have benefited his company.
I have not yet gotten to this job and been paid for it, so I cannot give a full rating of my experience, but I will report back.
In the meantime, my advice would be that when dealing with Weatherby, or with any recruiter, you send an e-mail back to the recruiter after every phone conversation, recapping what was agreed to ("Did I say I would rent you a car no matter what? No, no. I said I would rent you a car if the client agreed to it after later discussion."), so that if there are any "misunderstandings," they can be corrected before you have built any plans on them.