It is terrific. Everyone of a certain size company needs to go for it. I f we didn't have it and we had to investigate through other means it would be 2-3 headcount plus we would have to build our own tool and it wouldn't be as accurate as what they have got...it has incredible reach.
No one has data like them. I don't know what happens behind the scenes but I know the data is good...Other sources like VirusTotal have IP reputation data but it is unusable – it is crowdsourced and messy.
If you love a sense of purpose in a business, I'd highly encourage folks to listen to @Andrew___Morris talk about @GreyNoiseIO on the @RecordedFuture podcast...Great team and succinctly defined mission in the security space.