Where do I start:
It has potential, it can work great, mixed results from verifications (that might differ even on the same list), lots of bugs, still not close to being done

I used both reoon from appsumo and now brandnav, and all I can say is that the former is much better system that really works.

BrandNav is just not complete product, can't upload more than 50k, has problems reading the lists from time to time (one day it doesn't work, the other works), lists hang, doesn't refund for those that didn't clean so it's really not a great product. It's far from the bad, but not close to being good either.
For those who do heavy verifications on large lists, stay away (look at Reoon for example as a better and finished product), for those that just need some lists cleaning once/ month,, this should do the job (although it won't clean as well as competitors)

Their claim is 97%, I say that they don't clean as well as others, too many are catch all, too many are skipped. From my experience this would be like using a software for cleaning if your port 25 is open, so not an ideal solution.