Crystals of BETS conductors containing FeX4- (X = Cl, Br) anions are polymorphic lambda-BETS2FeCl4 undergoes alpha pi-d coupled antiferromagnetic insulating transition at about 8.5 K. But it exhibits a paramagnetic metal - antiferromagnetic metal transition and superconducting transition at high pressure. kappa-BETS2FeX4 (X = Cl, Br) are antiferromagnetic organic superconductors with the transition temperatures of T-N 2.4 K (Br), 0.45 K (Cl) and T-c = 1.1 K (Br) and 0.1 K(Cl). Resistivity step observed at T-N is the first direct evidence for pi-d interaction in organic metals. No distinct anomaly in the specific heat at T-c and the anisotropy of the recovery of resistivity under magnetic field at T < T-c suggest the coexistence of superconductivity and magnetic order in λ-BETS2. FeBr4. In contrast to the case of κ-BETS2FeBr4 exhibiting three-dimensional magnetic transition, small entropy of the transition of κ-BETS(2)FeC1(4) indicates the low-dimensionality of the spin system.