Long Tail Pro helps to assess the strength of your competition and put you ahead of your competitors. It would help you to rank higher than your competitors. When it fetches the keywords for you, it filters it and delivers the relevant ones after filtering them and making them relevant to your domain. This way it would help place your business and your website ahead of its competitors.
Am I worried that my keyword research might not be effective since I only look at the KC score? No. Not really. Because I tend to target only the longer tail keywords these days. I don’t go after the huge main keywords anymore. They’re too hard to rank for. But long tail keywords are really easy to find with Long Tail Pro and they are usually much easier to rank for.
I just have the free version right now so I don't know all that the pro one can do. But even the free version has A LOT of tools you can use, I haven't even figured them all out yet. But one that I have used is their Content Optimizer. You can take a new or existing content piece of yours, and compare it to one of your competitor's pieces on a similar topic, and see where you might be lacking based on the keywords that are used in each piece.
You can try DeepMiner. It is good for scrapping, rank position, generating long tails and keyword suggestions. You can export the data to document for later analytics. You can find popular keywords that people are searching for. 7 major engines are supported, Google, Yahoo, AOL, Amazon, YouTube, Ask, Bing. It supports multi-threading so it is very very fast scrapper. BTW you must use proxy list if you plan to scrap thousands and thousands of keywords.
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.