Free Vs Paid directory submissions.

A web directory is a directory on the World Wide Web that specializes in linking to other web sites and categorizing those links. Web directories often allow site owners to submit their site for inclusion. They are considered a relevant, focused and topic specific source of credible information.

Directory allows your site to gain backlinks, PageRank, traffic and consequently get higher positions in search results at various search engines and bring target visitors to it. The most notably benefit of directory listing is the unique and relevant back-links they can provide.

Free Directory Submission:

Mostly free directories are poorly maintained and your link will lost in crowed.
Less visibility means less traffic.
Low acceptance rate.
Increase one way links, Page ranks and Traffic etc..
Time consuming and more headaches.
Improve search engine positions

Paid Directory Submission:

Professionally maintained and rich contents.
More exposure to your website.
More traffic.
High acceptance rate.
Increase one way links, page ranks and Traffic etc.