I've tried Pre Jym, Pre Kaged, and a whole host of clinically dosed pre workouts. Pre Extreme takes the top spot by a landslide. Why you ask?
#1 they include carbs. Anyone who knows anything knows that there's nothing better for not only energy but pump as well than Carbs! Especially highly branched cyclic dextrin. The best carb on the market.
#2 It gives you a better kick than other clinically dosed products. Pre Extreme contains alpha yohimbine which really gets me going. Anyone sensitive to yohimbine hcl, alpha yohimbine (rawoulcine) is tolerated much better. Pre Jym and Pre Kaged really skimp on the stimulants, so this is a huge win!
#3 NutraBio Quality. This may be the fanboy in me, but no matter how many branded ingredients are in your pre workout, you can't beat the quality and transparency (they even include the dosage of flavoring) of NutraBio. In a shaday industry, NutraBio is a beacon.
I used to take Pre-Jym and swiitched to this after the whole Mark Glazier video (seriously hilarious but opened my eyes to how shady Jim is). Anyways this product is awesome. Way better pump, energy, and endurance than anything else I have tried. Doesn't stim me out either. It's a good, clean energy. Ridiculously high dosed!!!