I like primo.....I seem to feel really good on primo, I get nice clean gains, I also noticed my muscles stayed fuller looking even when I diet down.....it's also probably one of the safer compounds you could run.....the only down fall would probably be the price of it.....I personally need to run 400-600mgs a week......my training partner absolutely loves primo and he likes running 1cc a day of it, so 700mgs a week.