I am up to doing eight card sets in the Cambridge University Memory Training module now. There is definitely progress over the two weeks that I have been doing it. I'm having no problems with episodic recall - it's been a while since I have forgotten keys or appointments - and I am getting vastly improved visual dream recall as well. It has been interesting. I am noticing my instant recall is still weak, it often takes 2-3 tries to get a correct full circle of cards.
Anyway eight cards is the first unlocked set of extra rewards, with 30 normal rewards before it which you get one per day. So I think it is normally encountered between 20-30 days in, which means I am progressing quite rapidly. I intend to do at least the complete month of training, and may do a second month.
On the main Peak app I am progressing steadily, around the 50th percentile in most things except problem solving and memory, where I am around the 60th percentile. This i see more as a long term thing, although I notice action speed is a limiting factor in score in many games and that really doesn't interest me. Hammering the buttons to get the high score is so old school.