I run a graphic design agency and currently I am using Rocketreach and Findthatlead. LeadRocks application definitely seems to be born with the expectations, and for this kind of lifetime or perpetual license-it's indeed a no-brainer.

My only suggestion would be to add a feature by which people can find the emails of phone numbers or people using their LinkedIn profiles individually (instead of a list) just like RocketReach or Lusha Offers.

Overall, I am Very happy and definitely gonna use them for my lead prospecting.