Why do people think PRL-8-53 is magic? There is one study showing that they remember some words better than placebo, how is that life changing? Even a digit span of memory of 21, how will it change your life?
Having increased my digit span to 10-11 from a baseline of 7, I must agree. In my case, the cognitive training does not seem to have translated to any real-life benefits. Ah well, at least I did prove to myself I could increase my digit span and aspects of working memory, reaction time and extended concentration in specific situations significantly by training them (and possibly helped by nootropics and tDCS).
But there has been no transfer it seems, and my social skills seem to have taken a hit - at least it feels that way.
So now it is time to get serious with meditation and yoga instead.