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I've worked with Works Hub (specifically Functional Works) very successfully - they offer great customer service and they successfully helped me in hiring a number of candidates.
More important than the product interface is what it gives access to, namely the WorksHub team; they're a cut above other recruiters I've worked with, either as a candidate or an employer.
This was by far the most well structured and supportive process of finding a position I've ever gone through. I strongly recommend works hub.
I just landed a pure FP Scala job through Tom, i cannot think of a single negative point about the whole process, he is definitely they most professional and efficient recruiter i have worked with.