Hmmm. Since you're discussing Don's RY4, I'll throw in my two cents...albeit old, maybe. I generally vape only Don's Espresso or Backo. I stopped trying out tons of flavors, and have been very happy with just the two mentioned, but I did try the RY4 several months ago. To me, not only did it have a nice, rich caramelly flavor, but I also detected a slight menthol-like flavor that gave it a bit of "freshness" on exhale. I've never seen anyone mention this, so maybe it's just me. I was never a menthol smoker, so it was pretty noticeable to me.