Surge Mixed with Fasttwitch from Cytosport

Do you all see anything wrong with mixing Surge with a caffeinated pick me up like fasttwich, if you dont know what fast twitch is its alot like no explode or any pre workout Wake up/ get amped drink. I like mixing them because Surge makes me noticable stronger and gives me longevity in my workouts and fasttwitch wakes me up and gets me really focused.

Do you think mixing them takes anything away from either one? I like the combo and it taste good, any reasons why i shouldnt?