Review of Grape Flavor-INW:

This grape is like a mix between concord and white.  Like most INW flavors, this is nice and strong so you can keep percentages low and still get a full flavor. 
I've tried other grape flavors including grape soda and grape candy. Those require high amounts to get a taste, and there's a chemical aftertaste with those too.  Not this one though. This may be my new favorite when it comes to grape.