DMARC Report is providing me with important insights into the health and reputation of my clients' domains and email operations. This is a fantastic value add to my B2B services.

The tool is feature-rich, super easy to set up, and it has great reporting and filtering capabilities, and even configurable alerts.
I find their policy of having unlimited domain together with white labeling SUPER generous.
DMARC Report parses and aggregates tens of thousands of lines of Raw XML for me and displays the findings in an organized way. What to do with all the data is a different question, and it's the nature of the beast that this can be complex or overwhelming. That, of course, is hardly their fault. The support section has a lot of good training material, but I feel that it could be a bit better organized, but that doesn't diminish the product's value for me.

10 out of 10, a total no-brainer this one!