C4 EXTREME BRAND CELLUCOR your experince

So i just started using this for my last 2 workouts I really like i got the pink lemonade flavor and take half scoop gives me energy with out any side effects that i have notice so far when i use i feel like i workout twice as long as use i usually ran out of time for working out rather then before when i was just get thru a hour workout .
I want to know how has it work for others and what was your experience?