The most useful features are their ability to manage all of your customer data in one place, so you can easily find it when needed! They also have an easy-to use interface that makes finding what we need simple as pie (as they say). We were able to track our customers' IP address history with ease by using this service - no more having multiple spreadsheets or files lying around for us employees who handle client contact/relationships to keep up with where everyone has been online at any given time during business hours!!