Here is Habeas's 2 page PDF document on the benefits of being on the SafeList:
http://www.habeas.com/fileadmin/resources/Habeas_SafeList_DS.pdf
Below is a chart summarizing delivery rate improvements in Habeas SafeListed senders:
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In addition to the JangoMail shared pool of IP addresses being added to the SafeList, any emails sent through a SafeListed IP address will have these additional headers added to the e-mail message:
Accreditor: Habeas
X-Habeas-Report: Please report use of this mark in spam to http://www.habeas.com/report/