Is Rank Ranger worth it?

Does anybody here use Rank Ranger? I am looking for an easy to use tool to check my sites SERPS rankings for certain keywords. Is this the right tool? Doesn't google Webmasters do this as well?
I dont want to spend money on unnecessary things if free tools like google webmaster will do virtually the same things.
Thanks, and advice at will help!

If you asked me this question a year ago I might not advise it, but I went back and tried it 4 or 5 months ago and they made major improvements. I heavily rely on their white label reports and interface for some of my clients, it's top notch. I can set some campaigns based on Google Places and others international, and the domain analysis report pulls data from GA, Majestic SEO, Ahrefs, etc. and provides social metrics. I guess what I like best is that I don't have to use a lot of different tools to get the info I need. Price? I guess it depends on your situation - number of campaigns/keywords you need to track. I'm able to more than pass on the cost to my clients and save time that I used to spend checking multiple tools. You might start with their free package and that could help you figure out if it's the best tool for what you need.