I think it depends how much you use it. Honestly, I don't use mine as much as I could/should. It's got LOADS of features, with the best being (hands down) the Game Time feature. When I'm playing at Party, for example, I can have it auto-importing my hand histories and showing my opponents stats on the screen right there in front of me. When you are multi-tabling, it's nice to know if the guy who just raised you is a 72% VPIP maniac or a 9% VPIP rock, ya know? And this allows you to know exactly how he plays.
You can also import/export player notes full of stats for every person you have ever played with. I find these two features the most useful, but there are certainly a lot more than that, like what I posted above.
For the record, while I will get a kickback if you buy Poker Tracker through the links on this site (scroll down - see banner), I endorsed it long before they even had an affiliate program. I'm a big fan.
It comes with a 1000 hand free trial. Download it and see for yourself what you're missing.
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