The reason I sometimes use this facility with the GKP is to find volume amounts for the keywords I’ve chosen. But, these days, it’s not so important. As long as the Long Tail Keyword makes sense and is something I would put into a search engine, then it’s good enough. Sometimes the most blazingly obvious keywords are often over looked by eager, trying-to-be-clever marketers. Sometimes you need a tool to highlight them.
The developer of the program Spencer has even modified the program to make it better and faster. Recently, a platinum edition of the software was released. This was to help webmasters in their internet efforts. The new version simplifies the competition process, because it allows its users to store their favorite keywords and get them anytime they need them. Moreover, the newer version makes it easier for its user to track their website ranking in all the search engines.
Long Tail Pro is a keyword research tool that helps you quickly find low competition keywords for your website.  In particular, the tool is built for people doing SEO (search engine optimization) as opposed to people doing paid ads (Google Adwords PPC).  I'm sure there are some advertisers that use the tool for paid ad keyword research, but the tool was built for SEO keyword research.