The ease of use, how well it integrates into other systems/apps like Salesforce etc., its ability to track leads from any source (email or social media).
It's not perfect but we've found that as long you have thorough documentation about your data sources this system will be able work within most needs! We are using CS in our CRM tool because I cannot find one specific software out there which has all my business functions integrated together seamlessly - hence why i chose cs over others who were more expensive than cas sevren was at time when looking around last year before purchasing solution.