This is the only email cleaning program that we use. This is mandatory if you are doing large amounts of emailing two new cold prospects. We have an extremely low balance rate from our emailing system. Clear out is our go-to program to do this and, without question, saves our email URLs for a longer period of time.
RainKing is less appropriate when you don't have the funds or resources to pay for it. You could easily Google the information that you're looking for, or use CrunchBase, but it's extremely time-consuming. RainKing makes this very easy and the data seamlessly sends to Salesforce with the proper integration. RainKing is very appropriate when you have a large team of folks that need to source leads/accounts simultaneously and need licenses to do so - it's worth the money with a larger team.
Being able to search for companies that are currently evaluating solutions in your space.
The contact information for people and related people is also great, I have used dozens of other data solutions and prefer Rainking.
Rainking also gives you the ability to create lists of your ideal buyer and download them which was great for my team and I pull new contacts to prospect!
I can't get over how impressive the org chart info is in RainKing, it allowed myself and my team to find other involved prospects and get a good feel for organizations.
I've used SalesNavigator and Zoom Info. I actually think that Ranking is a great solution if you can use it in tandem with SalesNavigator. When it comes to pulling lists, in my opinion, Ranking does it best. Now that it has the database combined with Discoverorg, it's even more powerful to use.
I don't have that information readily available to quantify the positive impact. However, I will say that I've found a lot of good prospects via RainKing to target my outreach efforts to. I definitely feel like the product pays for itself.