Is PokerTracker really useful for SnG's?

[Rocco]

It was a year ago since I discovered PokerTracker and began to use it. Need I say it did wonders to my fixed limit play? I've seen posters using it for SnG's as well, saying they can't cope without it. I don't see how opponents stats can be that important beyond the first level. I mean, an opponent's PFR, aggression etc. probably varies greatly in relation to his/her stack size. And when it comes to analyzing a bunch of SnG's for own records, we have other tools that suits SnG players better. Anyone care to explain why PokerTracker is necessary for SnG's?