This platform lets you outsource the articles just the way you want, you can have as many reviews as you want until the writer working on your project gets it right, or it also allows you to reject the content and have some other writer work on your project if you are not happy with writer's writing ability. Builtin copyscape API makes the uniquness easy peasy. Also, the keyword density tool which is builtin as well lets you check your keyword density.
Amazing platform overall
I have been happy with the service since i signed up with them.