While the adopted models for the inclusion of tunneling and the description of barrierless entrance channels usually deliver qualitatively correct results, they neglect a number of effects (e.g., variational location of the TS, non-vanishing curvature of the reaction path, etc.), whose proper treatment would require more advanced models. 13,68 However, these models require, in turn, additional information besides the characterization of the stationary points governing each elementary step. As a consequence, we prefer to postpone these aspects after the reliability of the proposed approach for the structural and energetic properties of stationary points has been definitely assessed.