I took epi and I'm in week 3 of SD. I did a 5 week cycle of epi at 40mg ed when I was on 100 grams of carbs a day it hardened me up and I had some slight strength increases. No noticeable gains in mass. I'm currently on week 3 of SD, I feel like straight ****. Bad lethargy and bad lower back pumps. I've put on about 10 pounds of mass but I'm also eating close to 300 grams of carbs a day.
If you've never done a cycle I would recommend epi at 40mg for 5 weeks.
I will never run SD again and my next cycle will be a test cycle. If you can get your hands on some test, by all means, do that instead.