Share 'Caffeine and Bicycling: Good or Bad Combo?'

It's come to my understanding that for some cyclists, caffeine and biking are like peanut butter and jelly. Admittedly, I like to guzzle a cup of joe before I bike the streets in the morning. I've heard so many mixed theories and explanations, would someone mind clearing it up for me?   Is caffeine good or bad before biking?