When you plan on building masses of links for your website to boost them in the SERPs, the issue is that sometimes the sites are of low quality with 0PR, I have tried several article submitters some with great success and some with poor success and even worse support! I have used Article Marketing Robot with great success, masses of directories, other benefits allows you to post xml feeds to get the articles indexed. (What is the point in submitting articles if they do not get indexed -nothing just a waste of YOUR time.) AMR gets my vote 5 out of 5. I have tried Magic Article Submitter but the support was rubbish, then I tried Article Demon, this promised so much and delivered NOTHING! Vote 1 out of 5 Article Demon - Only submitting 10% of articles in schedule mode, but submitting 250 out of 350 in one go, not ideal having 250 links in one day...reported the issue and the support refered to "lady luck", these guys are selling their software on a hope and a pray - avoid them. Vote 0 out of five. If you need to build quality backlinks to your site, use AMR, if it worked for me it will for sure work for you. I am sharing this information as we all know how important article directory submissions are to the new Google update, so we can all benefit.
I have same experience with you, and I believe that AMR is a great article marketing software on the market this day, I use this tool every single day to make a hugh of backlinks and now my site rank well for keyword I target.
SubmitEaze is worth a look too. It does pretty much exactly the same thing as AMR and it's priced the same, but also provides website directory submission from the same software. IMO you get better value for money with submiteaze.