I wouldn't say I've got A LOT of experience with nootropics. A lot of members with much more experience come to mind.
But I have tried a couple of things and Brain Candy is the best one so far and one of the only two that left me with absolutely no doubt regarding the effectiveness.
I've done 2 doses 2 days in a row (the samples that I got) - original first, then decaf. The effects were definitely there - significantly improved focus, better mood, decreased social anxiety, more patience, better able to resolve problems, etc.
I've added 3 cases to my next order. I'm going on holiday before it arrives, so I will start regular use in 2.5 weeks, 17th April. I will also give a couple of samples to some friends (2 bottles each) and see what they think.