Tren is an AWESOME steroid. But it is heavy with side effects, personally for me they include;

insomnia
night sweats/nightmares
hot flushes


that is all from 300mg tren e, a week.

I run test alongside it simply because I love being on test (500mg), and have no trouble downstairs.

Read everything you can find online though regarding it though. I still find it hard to live with, but it is my fav steroid for how it changes your body (in such a short time)