Within a day I was memorizing lists of 75 items forwards AND backwards. Completely random items as well.
It makes remembering names a joke, you will remember them for years.
I gave the book to my 15 year old brother and explained to him how much the book meant to me and that it was a very quick read (most of the good stuff is in the first 2 chapters anyway)
Keep in mind hes 15.. 24 hours later he comes back to me with a list of 100 items (to outdo me).. lists them forwards and backwards. That's my boy.
I distinctly remember going to a salon one time and they had tons and tons and tons of bottles of gel, shampoo, hair products lined up in a styled fashion along the middle of the wall going across the wall. by the time my haircut was done I turned around and listed off every shampoo bottle in order and the hair stylist was just like "WTF!!". She probably felt like i was a freak, but I felt really good.
Trust me, its great going to the grocery store and not needing a list, and coming up with all 35 items... makes you feel like a boss.