I used to drink two cans of Mountain Dew per day. I was 100% dependent upon it -- without my Mountain Dew I couldn't function at all. Anyway, I recently took a few weeks off between jobs, and during that time, I decided to quit caffeine cold turkey as well. I feel great! Some benefits include:
-Sleeping better
-Being awake and functional in the morning, even before the caffeine kicks in
-Having a consistent energy level throughout the day
-24oz of soda/day is not healthy, so getting that out of my diet was definitely a good thing