I've taken 9-MBC for a few months now, not every day, but when it's going to be either a 16 hour work day or I have tons of writing to do I take it on an empty stomach first thing in the morning. It definitely helps me be more focused and less distracted but it's nothing extreme. What I really like about it is the fact that it's not a stimulant (I hate caffeine, makes me jittery as hell).
Coincidentally, I literally just began taking Neurogenesis with the 9-MBC as of a couple hours ago. The idea for this combination was billed as a "study aid" stack, so if I notice any discernible difference by adding the Neurogenesis I will post here again and let everyone know how it went.
Not sure if I'm permitted to say a company name here, but the company that makes both of these products typically has very good products, including their pre-workout pill I take once or twice a week if I'm tired.