Hi , I tried the article submission service of the Provider. He was really quick and did what he committed. Although, I didn't support submitting same article to 300 directories, but I tested it on one of my social media profile.
I can see, 23 results for my article on Google , and they are increasing everyday , Will post one more review here , if i can see links in yahoo site explorer.
As Article was submitted only 4 days back , it is very quick to predict results, but you definitely get for what you pay.