I did an interview with the guy who discovered Tren. (Can't remember his name right now). Anyway, it was meant to make cattle grow -- which it did, but it had a bad side effect in regard to a food source -- it made the meat tough because the cows lost so much fat! That was the lightbulb moment for him.
So yeah, Tren is great for both bulking and fat loss at the same time. But there's a price to pay in regard to your health. I never touch it.