Should I carry hydration pack during the NYC Marathon?

As  the NYC Marathon fast approaches, I've really started thinking about race-day details. As I've mentioned, I've really enjoyed using my hydration pack during training, but I was wondering what people think about using it during the actual race.

During previous races, I've never carried my own hydration, but I'm not a big fan of getting stalled and sloshed at stations during the race.

I have my last 20-miler this weekend, so I would love to hear any feedback as I make some final adjustments.