An increase in the recreational use of ecstasy has prompted much research focusing on the effects of repeated and prolonged use. Less is known about the individual predictors of Ecstasy use although a number of studies have pointed to an impulsive personality style. The focus of this paper was to examine this issue by drawing on a recently developed dual-factor model of impulsivity (rash-impulsivity and reward-drive) which has specific relevance to substance use (Dawe & Loxton, 2004). Two-hundred and seven participants (102 users; ever used in lifetime, 105 non-users) completed questionnaires assessing rash-impulsivity, reward sensitivity, affect and motivations for use. As predicted, ecstasy users were significantly higher on rash-impulsivity and reward drive compared to non-users. Furthermore, negative affect was found to mediate the relationship between rash-impulsivity and motivations to use to reduce negative affect. This suggests an interesting link between rash-impulsivity, negative affect and ecstasy use that has yet to be considered. Discussion focuses on the role of both rash-impulsivity and reward drive in understanding the motivational processes underlying ecstasy use.