Directory Submitter by Brad Callen is good if you're planning to submit your site to thousands of directories to improve your site's ranking in search engines such as Google, Yahoo, and MSN. However, if you're managing the promotion of several sites at once, I don't recommend this software. Sometimes, it annoys me that simple actions such as selecting drop down menus, switching between profiles, and etc. can take 2 seconds or more. With several sites to work with, and having to submit to dozens of directories for each site, this can be inconvenient and pretty time consuming. The problem seems to lie in their unoptimized database or code.
After using it for a few months, I tried looking for another software and found that it's much better than this software. Stay away from Directory Submitter if you have several sites to promote. It's very slow, annoying, and inconvenient.