Pros:
- The usability of the tool is one of the best I've experienced. Simple, visually appealing and practical.
- The package of credits at Appsumo is generous for the market value.

Cons:
- My reference regarding performance in cleaning emails is millionverifier(dotcom) and I expected this tool emaillistvalidation(dotcom) to replace it. But no.
This tool does dust eventually, but don't expect depth.
It is useful, but not very efficient, especially in country TLD's (.com.br), (.pt) among others.
I did the experiment of putting the same DB in three different cleaning platforms and proved the results.

I will keep emaillistvalidation(dotcom) in my marketing stack, essentially for the competitive price. I'll start with this tool and then finish on another for double-checking and more granular tracking.