The properties of the salts based on metallocenium cations and transition metal bisdichalcogenide anions are reviewed and particular attention is paid to the correlation between the magnetic properties correlated and the crystal and molecular structures. The large majority of these salts have crystal structures based on linear chain arrangements of alternating cation (D+) and anion (A−) stacks which are classified in four major structural types, depending on the stacking motifs. The magnetic properties of these salts, which at low temperatures can present a wide range of magnetic order type and phase transitions, are correlated with the type of magnetic interaction between the magnetic building blocks, which in the large majority of the cases can be well described by the McConnell model using spin density calculations.