Though I have not tried alpha brain, ill share my experience with nootropics.
I am a musician, and tried several nootropics at a period of time when I had a bunch of new music to memorize. Basically, it seems like if you are getting results from nootropics, you are either wired differently than me, or you are experiencing placebo effect. The vivid/lucid dreaming effect is absolutely real though.
What I found was that I had to spend the same amount of time memorizing songs if I was to retain them as I normally would.
I hope alpha brain works for you guys, though, FWIW, I would advise you to be skeptical of the flashy marketing, and look towards actual reviews of the product before you spend your hard earned $.