Positives, ability to burn more fat at rest than you normally would, allows you to increase calories while on cycle without gaining excess fat, slightly increases the effectiveness of certain anabolics
Negatives, very dangerous of not used correctly, irreversable long term effects with abuse.....if you new to AAS stay away from it until you learn more and learn to diet and train correctly.....IMO not even worth using it, I didnt see any difference in my body worth mentioning from its use.