Ben
FFA pages are “Free For All pages”. They have lots of outgoing links on single pages and most of the links are just useless. Google treats these as link farm and these pages may harm your websites popularity.
As Bahava posted above that most of the Auto Submissions are useless. I will suggest you to go for Manual submissions.
You can submit your website to Info Vilesilencer Free SEO freindly directorylist. Please download the Excel file from the website it have 450+ free SEO freindly directories. All these 453 directories are free SEO freindly and are indexed in Google. So it will help you guys for sure.
I have more that 800+ SEO friendly free directories now. If you would like my team to submit your website to these directories please let me know.
Good Luck
Seomaster