I love it. Dont recommend this if youre sensetive to caffiene. It definitely hits hard, almost too hard.. If i dont move around i get anxious and slightly nauseated. But, taken before the gym, it is absolutely amazing. Any lack of motivation melts away and you get your heart pump and sweat pouring like crazy. Seems to mellow out after a good workout. Weird also, i dont ever feel a crash from these and when i cycle off it doesnt seem to effect me like many other fat burners have in the past, i feel fine.