The most helpful feature about this software has to be the ability for you, or anyone else with access to it, to see the results of one's search right away - which helps weed out applicants who may not have much experience working at your organization but appear to have excellent references.
I dislike how difficult it can sometimes be to find any information on an applicant within the system - even if they are listed as hired/rejected etc. This makes my job easier since I no longer need to call each person myself before letting them know their status through email.