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As a bit of a spicy fiend, I bought this (online) on the premise of the tingling sichuan.
The notes are there, but the overall potency is gentler than I would expect. Compared to say, Angostura (for sake of common ground), you'd have to use 2-3x as much of Mr. Lee's to get the same punctuation in an old fashioned.
I do find the flavors themselves useful. I've enjoyed it in a kinda-sazerac and when I needed a gentle savory nudge.