The free extension and our CSM is definitely trying to make us happy.
This is not a technology, but a service. You enter domains in a spreadsheet that can do look-ups. You cannot easily do a list build and the way they do look-ups eats into your API calls, which are limited every month. My CSM is definitely trying to be helpful, but the technology is just not there. If you are in the US, they are based in Israel, so you will usually get a response the following day. So far, I am disappointed that I moved from free to premium.
Ask a lot of questions and have them show you their capabilities in the product (or lack thereof). They have over promised and under delivered to the point of not delivering at all.