I take between 2-4 ErgoPharm Amp pills before my workout and they give me a noticeable amount more energy during.
But every other time I feel lacking in energy I drink a Rockstar
I, personally, love it. I'm not on gear or anything, just creatine and I've gained 16 lbs since January. I'm taking a week off then starting over with sets of 15.
I like it a lot more than split training