I'm not a huge fan of pre-WO stuff but I've tried a few. I tried N.O. Explode, it was good for the first 3 times I used it, then I had to bump up the dosage to 2 scoops to get anything, which I became accustomed to very quickly rendering the product completely useless. I also tried Labradas Supercharge which was pretty good and I didn't become tolerant to as quick, but after 3 weeks of use I dropped it because I started getting the shakes and my BP went up during workouts.