You are in total control of the content written. As the article requester, when an article is written for you, you have the ability to review and make changes before submitting for payment.
This allows the buyer full control of the content needed. You can reject the submission if you feel it is not to standard for what you are looking for.
I have requested several articles throughout the years and at time, different topics can take anywhere from one day to multiple days to be picked up and written for you. As long you provide a full comprehensive outline of what you are looking for you will have no problems finding a quality writer for your project.