I have a high tolerance for stims & plain caffeine just doesn't cut it anymore. These drinks have a good, but simple ingredient profile that seems to work synergistically for a good boost in energy. I'm also quite particular about flavoring. I've tested too many energy drinks that had a medicinal, mechanical, or metallic aftertaste. Or they're loaded with sugar and overpoweringly sweet. Not these. I do wish they used a natural sweetener like stevia or monk fruit, but sucralose is fine in moderation. Last but not least...good price. Price is on par with other energy drinks that are less effective and have lower quality ingredients. These drinks are a good deal!