I take this with focus+, so I'm not sure they can be reviewed separately. What can I say? I don't know how to describe it exactly, but I just feel better. My mind is calmer, like I'm not over-thinking everything. I feel like I can reach decisions faster and remember things more clearly. Overall, I just feel... better.
And having recently run out, I can see a difference after just a week of not taking it - it's not overly drastic, but it's like the difference between waking up early on a Saturday feeling your best vs waking up on a Wednesday after your aunt's fourth wedding and you have to somehow deal with every day work after all that.
These things really work - I have all but phased out coffee and energy drinks in my morning routine. They act fast, kicking in within 15-20 minutes. I feel energized and refreshed for at least 6 hours. There's no crash at the end either, so usually by the time you notice it's worn off it's about time to be taking sleep support+ (also highly recommended).