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That's what I'm talking about. Everyone says that PokerTracker is a must, but is it really that helpful??

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VERY HELPFUL. I use it to find leaks, review my sessions when I'm done. If you understand that during a session, every one of us will make a mistake (sometimes more than one), then a tool to review is a must. With PT you can review/replay your hands, think about them, and post the ones you're unsure of in the micro forum or small stakes if you've moved up.

I also use PT to review my opponents, revise my notes taken during the session. review the play of their hands, etc. After a while you should be able to get a better feel of what your opponents bets, raises, and calls mean and get inside their heads. All of this adds to your EV.