I just installed the deck tracker a couple of days ago, although I rarely use it. I just thinks its nice, being able to see what cards are in my deck, seeing as I'm switching between decks pretty frequently. I would not say that it gives me an advantage in a sense, other than it's easier than for me to keep track of my decklist separately. I kinda think people are making a bigger deal out of it than it is, but maybe that's just me.