TC Nutrition did things a little different with their Preworkout BATCH27. They sourced the most scientifically reserached ingredients and put them into their product. A good preworkout should give you:
Extra energy
Enhanced musle pumps
Long lasting enduranvce
Extra strenght output
Laser sharp focus
and most importantly, put you in an anabolic state, increasing muscle protein synthesis, allowing you to put on more muscle.