(disclaimer: I've been advising this company and helped design the content creation process)
As I really wanted to be able to access a written content service that would match my needs to establish a brand. It can sometimes be hard to hire a full time content writer at the beginning of a project.
We've been working with a bootstrapped version of the service on almost 90% of content related project we had with Gertrude, ArtList, Stellar Base, Stellar Formation, KeplerBot and now Jour for the past 6 years.
They understand how important it became to create high quality content without missing on key elements like company voice & culture.
Highly recommended!