I was on tren ace for 12 weeks (for prep) and by 4 weeks out I started getting serious sides. High BP (my feet swelled up so much my shoes started fitting tighter), couldn't sleep at night, was very short tempered, and cardio was getting harder and harder to do. Came off for 3 days and all sides disappeared. So if you're going to do tren, I'd go with ace. Just because it clears the system fast if you start getting sides like I did...