The biggest advantage for me is how quickly I can turn operational data into reports that are actually useful. Earlier, I had to collect information from different systems before creating a report. With ZoneReporting, most of that work is already done because the data is available in one place. It saves a surprising amount of time every week. Review collected by and hosted on G2.com.
Some report templates could offer more design flexibility.
A few advanced filters take time to understand when creating complex reports. Review collected by and hosted on G2.com.

