Kona is a very divisive concentrate but if you use it at very low concentrations 0.08 - 0.15% you'll be able to add an earthy nutty note to your blends.
It is very very potent and should be treated as such.
This one is one of the more distinct flavors out there, so it's going to be one that you either love or not. A real black coffee flavor that works well with Tobacco flavors, not at all sweet. 5% mix with short steeping time works out as good value too.