I always used Twin Labs products and when I came off of them, I noticed being very moody and lethargic for a couple of days. For me, energy drinks are a quick jolt of energy and then a huge crash period. They only work for me for like an hour and then I seriously just wanna go to sleep. The only time they have ever done anything for me is when I am sick with a cold or the flu. I drink like 3-4 Monsters back to back to back and I feel great. It also seems to shorten the duration time of feeling like total crap.