Poker Tracker

[GoDownSwingn]

I just joined the forums recently when I decided to get a little more serious about poker. After reading through the forums, it seems like just about everyone uses Poker Tracker or a similar package. In order to become a winning player, is it pretty certain that I'm gonna need to use something like this?

It seems like it is such a necessity among serious poker players that anyone not using such a system is at a disadvantage. Are there are winning players that don't keep any of these stats?