They keep notes on players in a database, and keep records of all your plays, etc. that everyone who has the software can access. So I do see it as unfair. but I do waht I can to counter act by keeping notes of who uses it that I know of.
If you sit at a table with someone you know uses it, look yourself up, and play completely different that what it says, Seems like the users of it take what it says as gospel.
I think in the long run, its mainly used by bad players trying to get that advantage, instead of actucally learning to play.