I have ordered 15 articles from this writer. The writing is very high quality, no errors what so ever and it is very readable. I'm very happy especially when comparing with the price.
However, it seems he just takes article online and rewrites them. One of my article he has sent me was in the same structure as article I found online for the same subject.
Now for seo purpose, this content isn't truly unique. Content is king always. What makes you think Google bot can't tell it is the same content especially if it is the same structure? This is more of a rewrite service from articles the writer found.
But you should remember all content writers do the same thing, but this is probably the best I have seen. I will most likely be ordering again and again.