i finished a 1-t cycle two weeks ago. i gained 12 lbs. and kept bf about the same, so i'm really happy with the results. my problem was the lethergy. i had planned on doing a 5 week cycle, 2 months off, and then another 5 week cycle. starting about the fourth week it hit me hard and i wound up stopping at the end of 4 weeks. after experiencing that i would be reluctant to up the 1-test levels any higher. i'm thinking my best cycle is probably 1-t for three weeks. i didn't notice any other side effects though.