By using a technical challenge as the first step and fast forwarding people to an advanced interview stage, we're eliminating candidate reluctance and increasing transparency (the candidate interacts directly with the hiring manager through our platform).
In our experience, telling the candidate "Show us your skills, impress us, and you'll get an interview" is better than "Tune up your resume to pass every possible filter". Showing your skills early on also removes a lot of stress from the candidate and gives you something solid to talk about during the interview.
Edit:Our homepage shows some numbers and case studies are available on request: http://www.gapjumpers.me/#genderResults