When the first studies by Jaeggie on IQ came out a few years ago I hit dual n back pretty hard trying to improve my IQ. I don't think I got any smarter, but I did notice a few things.
Pros
My attention got better, I was less easily distracted.
My executive function was better, I made better choices in life.(less junk food, fewer beers)
My thoughts slipped less often, I had those "what was I just talking about" moments less and less frequently.
Cons
Sometimes I felt overly focused for social situations. Like the feeling you get when you've been studying for 4 hours, and then try to the shoot the shit with someone, and you end up being too rigid/serious and instead of playful/fun.
Pros
My attention got better, I was less easily distracted.
My executive function was better, I made better choices in life.(less junk food, fewer beers)
My thoughts slipped less often, I had those "what was I just talking about" moments less and less frequently.
Cons
Sometimes I felt overly focused for social situations. Like the feeling you get when you've been studying for 4 hours, and then try to the shoot the shit with someone, and you end up being too rigid/serious and instead of playful/fun.