OK, these juices are only 3 days old, but curiosity got the better of me and I tried the RY4 and Ejoker...
RY4: Tastes like a crisp, clean, light tobacco, with a hint of something I can't quite make out. This unknown "something" has a somewhat chemical taste to it, but not in an unpleasant way at all. In fact, the more I vape it the more I like it, even though I don't know what "it" is. Perhaps it is the "uncommon vanilla" the juice description on the website speaks of, but at this point I can detect no vanilla taste at all. This juice is just too young at this point but hey, I already knew that.
Ejoker: A much stronger taste than the RY4. Strong, but not overpoweringly so; there is a light, crispness to the taste as well. I get cinnamon and menthol, menthol and cinnamon, and somewhere lurking in the background is that same chemical "something" (again, not unpleasant!) that was more pronounced in the RY4. Again, like the RY4, this juice is simply too young to get anywhere near the full intended effect. Even so, I can't seem to put either one down, and I'm currently going back and forth between them trying to figure them out!
My best guess, based on the fact that these two juices share a common ingredient which is in limited supply, along with my subjective experience of a common "chemical" taste in both juices, while not tasting any of the "uncommon vanilla" in the RY4 that I should be tasting...the "chemical" taste I am getting will at some point revel itself as a vanilla taste, both as a main taste note in the RY4, as well as a more subtle taste note in the Ejoker. How's that for a run-on sentence.
My favorite theory, however, is that the secret ingredient in all BWB juices is some ancient elixir Don discovered in a hidden cave somewhere in the Shawangunk Mountains, possibly near Lake Minnewaska
