The only convenient thing about it Data is the plug in feature to SFDC. You can also upload or import the leads directly into SFDC.
The data is old, outdated or simply unavailable. I found much better data with DiscoverOrg or just going to LinkedIn. Many times when you upload the leads to SFDC they do not transfer correctly and or do not transfer at all. Many duplications and wrong account tags.
Again, this is typically a free plug in for your SFDC CRM platform. Being that it is not an additional upfront cost, that minimizes the negative impact of having poor data.
Finding contact info for sales prospecting efforts. Using data for prospecting into new accounts and aligning organizations to the proper vertical for account based selling.