i believe Shulgin himself remarked that putting large functional groups at that position render the compounds basically non-psychoactive and with that rule in mind i'd always assumed this would have little psychoactive potential. there is also a paper out, "A Novel MDMA analogue, UWA-101, that lacks psychoactivity and cytotoxicity, enhances l-DOPA benefit in parkinsonian primates" (Johnston and Miller, et al, 2012) which noted that "treatment with UWA-101 did not elicit any effects consistent with psychoactivity" (at least, when compared to MDMA). of course laboratory primates can't elucidate the finer points of a chemical - their measures of psychoactivity are in that sense a bit crude - and maybe there might be something very mild in a high enough dose (i believe they tried 1 mg/kg and 3 mg/kg), but this paper seems pretty conclusive... it also advances the hypothesis, as ebola mentions, that it functions mostly as a serotonin and dopamine reuptake inhibitor.