Original Defcon1 was awesome. Total focus and strength. New one not so much. Bullnox at one scoop is decent. At two scoops however the focus is awesome. Makes you aggressive with a clean but strong energy. Usually add a rep or two to my exercises with it.
Other ones I really like are Metabolic ESP and ACN Pump and Grow. Both very high energy and focus pre's. ACN pump and Grow really surprised me. Not very well known, but two scoops of it (the maximum dosage) is very intense. Perfect for a heavy workout.
I'm a pre workout junkie I'll admit. I have a few I haven't opened yet waiting to try. Including Man Pep Test Bulk, Hypermax, Angel dust, Nutraclipse Alphadrive, Stimul8, and a couple others. It will take me a little while to try them all because I only use them twice a week and I travel for work alot and don't use them on the road. However the goal is to come up with my top 5 rotation. Any suggestions are welcome.