Introduced to correct for systematic underestimation of open-shell electronic states, the role of the IPEA shift and its recommended value of 0.25 a.u. have been controversial recently. For excitation energies of organic molecules, setting the shift to zero seems beneficial -at least in combination with moderately-sized basis sets. Contrarily, studies on the high-spinlow-spin gaps of hexaaza iron(II) compounds sometimes suggest using even larger IPEA shift values to obtain the correct spin-crossover behavior in CASPT2 calculations. Systematic studies on the correct description of excited states of transition-metal complexes -and, in particular, when these states are of different electronic character -however, are still missing.