The Memento Gimmick

I liked the Memento gimmick, of going back in time as if the scenes were in reverse chronological order. In fact, it is more than a gimmick! It's an ingenious way to make the viewer feel like the main character Lenard feels. I was lost for a while, imagine if that was every15 minutes of your life. At least he has a "system" to keep things in check (not).