The ability to find leaks in various forms, whether it be credit card numbers or even social security number is great! You can easily search for different types of leaks without having any idea what you're looking at first because there's so many options when searching.
I don't like how difficult some terms are - especially if they have acronyms involved (SSN). Sometimes its hard finding things that make sense with my searches and sometimes i just give up trying instead going back later after reading more about other ways to do this process. Finding small data entries such as phone #'s, SSNs etc has been very useful over time.