I personally wouldn't be motivated to use it either to find work or to hire. I think, when hiring, you really need to do a face to face interview. I've found resumes work well enough for pre-screening that it's not a pain point for me. And, it's not like there are so many candidates out there looking for work that it's impractical to do face to face, or at least telephone/skype, interviews with all the good candidates. I learned the lesson that face to face hiring is needed by hiring someone based on a co-worker's recommendation (even though he did badly in an interview, I looked passed it based on the recommendation). It's so costly and painful to make a hiring mistake that there's no way I would deviate from the current model and try a new method or service.
That really depends on your target market. For the most popular technologies (.Net, Java etc) in the most popular areas (London, Glasgow etc) for low-to-medium positions, you'll get tons of decent candidates.