Hi lilblack. My advice don't ever use robots. They look like spam and you articles may not get approved anyway. My advice, use an article spinner like jetspinner etc and submit an unique version of articles to the directories. That way you will have more chance of getting approve.
I use articles submission, mainly for the purpose of getting backlinks, so I will submit the articles to most SEO friendly directories and NOT just by submitting a few.
Of course backlinking still works if your article got some viral element and submitting to a few directories. But seriously, for that to work well, the article itself may cost you a fortune!
Hopes that help