I use KWFinder as my go-tool tool for keyword research for my blogging site - MostlyBlogging.com.
I like Mangools KWFinder to try to boost my content's standing in the SERPs for the following reasons:
1. KWFinder is user-friendly. "Green" means "go," "Yellow" means "proceed with caution" and "Red" means "Stop. Don't proceed." Therefore, using KWFinder is as easy as driving a car.
2. KWFinder is accurate. I've used other keyword tools with disappointing results. I've never been disappointed with KWFinder's accuracy.
3. The support staff is helpful, friendly and responsive.