Value for Money
Cost wise you only pay for a CRM solution but you also get a job board something that is gold for recruiters, an extra job board is always welcome. It does also save time, something that most of us fail to realize it takes a couple of minutes to parse a candidate to any crm system with all the information in a resume, Bullhorn solves this by automatically parsing candidates to its system,specially if Monster.com is linked. You can save precious time and get more time to reach candidates vs parsing them.
Nothing really , I just wished they had like a night mode or a livelier color scheme.