I've been looking at this lately with my work with Torbit. One thing to keep in mind is the performance hit you may take from including that seal. They are us

I've been looking at this lately with my work with Torbit. One thing to keep in mind is the performance hit you may take from including that seal. They are usually served directly from the certification companies website and often take multiple seconds to load. Depending on how they block the rendering of your page, the seals could actually hurt your conversion rate just from the performance hit.