My experience has mostly been unfavorable. As it is currently set up, to me it's worse than a crap shoot. Once, when I had a trip listed that I wanted and instead got another trip, yet the next guy got the trip I wanted I called them to inquire what was going on. After being put on hold for 10 mins the answer was basically, "Oops, sorry." Yeah, maybe I could have gotten the supervisor to change it, but the difference wasn't that big between the two trips. The take-a-way for me from that experience and other is that it's a 50-50 shot at getting what you want, yet you're having to hang it out there to get hit with an assignment.