It's not the only solution out there. People who use iScore seem to love it and say its' more powerful than Game Changer. As for following games, yeah, I've loved using that ever since a nearby LL team went to West and then to Williamsport. It reminds me a little of listening to games on the radio when I was a kid, especially when the scorekeeper takes the trouble to make notes on plays and calls and subs, like Bolts says. I'm following a game between two of our league rivals right now.
My kid's HS team is currently playing in a big tournament and quite a few parents who couldn't make it are following, and they have been texting and emailing me to say how much they're enjoying following on GC, so that is cool. I've been adding as many notes as I have time for.
As for being definative. Good point, but what is? It's always subjective regardless of how you record. So why GC and not a book? Well I think many teams use both -- a book in the dugout that is "official" and the electronic book in the stands so that nobody has to input stats later on and export to MaxPreps if desired. The HC keeps his own notes and compares against what GC shows, and if he doesn't like my call on hit/'error or whatever, it's quick and easy to override it. The other question is how well does it calculate stats. The answer to that is I don't know. I haven't really looked to hard at that but it seems to be accurate if the person inputs the plays correctly.
BTW - in reference to sac fly thread, you can override stats in cases like this.