Who uses assistive tools like PT4 and how it can help you with your game

I don't like them much and have never use them but I believe that they are more useful in terms of study to check on your game and analize situation off the tables I believe it is mandatory when you're on stakes above NL100 on cash games for HUDs cause of the multitable they help to keep track of players with a quick look on their statistics for tourney they might not be that necessary not even on high stakes only to study your game off the tables... it is also cool to keep detail stats and tracking on how much have you won or spend xD