4-fluoroamphetamine should NOT have any MDMA like effects(as some report), but should strongly resemble amphetamine.
I just looked over a study (Marona-Lewicka D, Rhee GS, Sprague JE, Nichols DE. Psychostimulant-like effects of p-fluoroamphetamine in the rat. Eur J Pharmacol. 1995 Dec 12;287(2):105-13.) -- Sprague and Nichols do the COOLEST research, and it seems that 4-FA is most similar to straight up amphetamine, and does not share many similarities (at least in rats) with MDMA and other drugs (MMAI, etc) that act on serotonin. Other research I looked at confirmed this idea -- 4-FA appears to have virtually no effects on serotonin (less even than amphetamine).
4-FA had more more potent but less selective dopaminergic effects than d-amphetamine.
Fluorination of amphetamine also causes the drug to be eliminated from the brain more quickly. So, the effects won't last as long as amphetamine's (this could be a good thing).