
Two things I like best:
1) direct access to the writers. It's more of a collaboration, and we can post questions and answers back and forth to make sure the piece is on point.
2) the platform has features others don't. The ability to save briefs, profiles, set up folders, segment different writing teams. It's a very intuitive and robust system. I love how you can see which writers have been active, can see their projects per month rate. Review collected by and hosted on G2.com.
It can take a few tries to find a writer that is a fit, especially when you are looking for highly niche and technical writing. The WA staff can help, but sometimes you just have to see for yourself. When I've had a particularly bad performance by a writer (rare), WA has been responsive to make sure I get my money's worth. Review collected by and hosted on G2.com.