I know this post is way old, but I grow GKBs. They have an amazing flavor, and have a great heat profile.
My experience and many others who've tried mine have the same experience.
Center of Chest warmth, Forehead warmth, eye socket area sweat, esophagus warmth, and nose running/clearing.
Warmth isn't to be confused with burn. The burn is mostly contained in the mouth, and isn't much on the tongue. It's just an over all gum, cheek, and roof of the mouth (the latter is variable, likely due to what you've ate or drank in the past day or two).
Hope you guys enjoyed your GKBs. It's so far my favorite. Habenaros are like water to me now LOL!
Also I make them into powders mostly, because fresh just don't last long enough. Powders almost reach each of the two harvests here in Florida, for my couple of plants keep at a time.