A couple years ago, the A Frame aid station had issues and couldn't keep up with the demand. There was a line of people waiting several minutes to get water - and then could only get one cupful.
I don't know what the issue was that year but, if it wasn't resolved or happens again, better to be prepared.
Actually, I never heard what the issue was so, if anyone knows what the issue was that year, I'd love to hear it. It might ease some of my concerns of it happening again.
In response to:
Then get a waist pack (http://www.nathansports.com/hydration/waist-paks) or just use the camel back, rip out the bladder and put a bottle in it.
The point being that the camelback is great if you have on a long training run and absolutely have to drag 6lb of water along with you because there are no aid stations. My main point is that we have aid stations, so no need to be a camel and that if speed is of a concern than you should make sure it is super easy to refill so as to to take advantage of those aid stations with a minimal time penalty.
Now a lot of runners are set in their ways. I understand that. In fact, if you are in my age group I encourage you to remain set in your ways since the extra 5lb of water will make you about 5-7 minutes slower. :-)