The daily habit part is what sold me — I actually look forward to the cup now, and the herby taste has grown on me way more than I expected. Two weeks in and my afternoon headaches are noticeably less frequent.
The herby flavor took a cup or two to get used to, but now I actually look forward to it. What surprised me is that after a couple weeks of drinking it daily, the tension headaches I usually get around 3pm have mostly stopped showing up.