OK my review all be it a bit early to say.
I am getting good rankings although the site is on a domain that is 6 years old. The PR is currently 0 so will post if i see any increase, i can see some links in google from the work.
The content isn't that great with a few typos, if i was to use this service again i would write maybe 10 short articles. That said the main point of this is to get link juice, i cant see many people reading the content.
Out of 10 i'd give the service 6, with the points knocked off for the content.
I will review again in a month as to any improvments in rankings.