I've gone up to 1 gram of tren ace for a brief period of time. Very fast and dramatic body comp changes. Ran only 100mg of test with it with low dose AI and caber. Sides were not too bad. Used seroquel for insomnia.
It's all relative. It seems the longer you're on tren either the sides lessen, or you adapt and they're "not too bad." High dose tren is something that shouldn't be ran long.
Low dose tren over a long period is very, amazingly effective.