The only thing I don't like about these types of sites are the fact they are too often scraped and the content put on a ton of little-traffic low-ranking blogs. While this can be useful in creating backlinks you are not guaranteed a link every time the article is used. A good rule-of-thumb to think about when it comes to backlinks....its not the quantity its the quality.
I believe that will take up 2-3 month to wait to have links in the articles you have submited indexed. And there is big risk with panishment for double content.
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Wow thats one huge database of article websites. If you have the time writing a few unique articles that reference your site would be a good idea but don't expect a huge up in traffic the nest day!