I've tried 3 so far.
1st, the black; spicy but sickly sweet with it. A bit cinnamon-y I thought. Wasn't keen and probably won't use it again.
2nd, Blue. Initial blast of strong grapefruit, I think. All day hints of citrus mix, lime/orange?
3rd, Red. I like it and it seems familiar but, like Mark, I can't pin it down.
Been full of cold all week so may be experiencing reduced smells.