Tomba appears to be quite mature in their platform (minimum bugs, super fast return for every search).
This is the only platform where I can find more information than any other lead generation tool I've purchased from Appsumo.

This is the best so far, and the founder is very active in the Facebook group. I don't see the founder saying yes to every request, which is a good thing. It should stick to the roadmap and focus on what is most important right now, rather than every feature that a user requests.

Continue the great work.