I don't drink coffee or any caffeinated beverages, as of right now. There was a four or five month period of time when I was quite the caffeine addict, but I go hard or not at all. I decided no caffeine was better than an intake of 1 to 2 grams per day (a cup of coffee has about 0.1 gram). That said, caffeine, no matter how high the intake, tended to put me to sleep as opposed to wake me up.

I suppose this was more about coffee than caffeine, but to me any caffeinated beverage is all about the caffeine. I wouldn't drink decaf though, as I don't like the flavor.