The first test of quality of a new surface is its capability to reasonably reproduce the ab initio input data used in the fitting process, which is obviously a self-consistency test. The barrier heights represent another very sensitive parameter describing the topology of the surface, being reasonably reproduced. We obtain (in kcal mol -1 ), +1.19 versus 2.05 for R1 and -1.36 versus -1.73 for R2 path. In addition, the PES-2024 barriers simulate previous theoretical results, which present a wide range of absolute values depending on the level of calculation. The most accurate study gives barriers of +1.92 and -1.87 kcal mol -1 , respectively, in accordance with the present results. Finally, the new PES-2024 surface correctly describes the presence of a common reactant complex in the entrance channel, stabilized by 5.35 kcal mol -1 with regard to the reactants, and the corresponding product complexes in the exit channel, stabilized by 0.51 (R1 path) and 5.00 (R2 path) kcal mol , in this case with regard to the respective products in each path.