The ease of use, quick results for new domains we are testing with SPAM scores that need to be improved (which is most!). We have not found anything significant in terms or cost savings compared other products out there like 360 SafeMailer which provides more comprehensive features at lower price points than powerDmarc's free version offers. I am happy they offer it as part our membership plans but would definitely recommend checking them all before deciding what you might want if their pricing model changes down future - just ask about discounts! Having an easy way to report spam emails coming into one domain versus another has been very beneficial given how many different people work through those accounts every day.