I use it .
There is good and bad about it.. You very often get numpties posting wanting a weeks work for £100. but there are some good jobs on there, you have to be very picky as to what you decide to quote on . Essentially a good idea but there are pitfalls. However I have had 3 good jobs off this in the last 2 months. I would say do not rely on this to keep you working constantly but as a top up it can work. You have to be able to sell yourself tho cos you are up against other people who want the job just as much.
Phill