I have been usind the common DMARC reports from the DMARC policy, but it's a mess trying to see everyone of them or guessing what they mean. Or even storing them in case they're needed. But this tool makes everything easier and it very easy to setup. Once you set it up, then you can forget and just monitor the reports in easy way.
And you don't need to worry about that matter anymore. Everytime you want to check, you just go to the domain and see the report. Easy as two clicks.
The only thing I struggled to setup was the MTA-STS report, but overall it's easy peasy.