I just tried this a few hours ago - really great flavor, very smooth, no weird aftertaste (no aftertaste at all, actually). I'm very satisfied as someone who loves caramel and always looks for caramel-flavored options when trying something new. Definite hit!
One thing I should note is that I have not tried - nor am I likely to try - this with water, only oat milk. My initial experience (which I will go into more detail on with my Saint Louis Gooey Butter Cake review) was that water just makes it too watered down and left me wanting far better.