meh, I like Jack'd better if your really into simmy pre workouts. As I get older I go for something that has BCAA, Creatine, Citrulian or AAKG, Beta Alinin and a lil caffeine.
the other mesomorph formula that has senegalia in it instead of dmaa gave me more energy and no crash or headaches. so i think it's better than the dmaa formula