I would never encourage anyone who owns a website or runs
SEO campaigns to use an automated service.
SEO should necessarily be a more intricate process, specifically geared toward your website, your content, your industry, etc.
These services, while cheap and effective at getting your site listed seemingly everywhere all-at-once tend to do more harm than good - slow and steady is always a better approach than any of these types of sites (free or paid) can offer.
Spend time researching
SEO, learn what you can so that you are more empowered as a business owner - and then take the time to tweak your site on your own, submit your own links, etc. The results will take longer but will also last longer and have more impact.
Google knows the difference between 200 links to your site showing up *tomorrow* and 200 populating across the web over the course of a month - organic is always favored in search results, always.
Hope that helps!