Bond, angle and dipole moment errors relative to standard PBE/6-31G* results for 52 molecules upon geometry optimization. The statistics under the heading ΔErxn are adiabatic SCF energy differences corresponding to the homolytic bond dissociation reactions: C2H6 + H2 → 2CH4, C2H4 + 2H2 → 2CH4, C2H2 + 3H2 → 2CH4, N2H4 + H2 → 2NH3, Si2H6 + H2 → 2SiH4, and H2O2 + H2 → 2H2O. μSE and μUE are the signed and unsigned errors of the property, respectively, and whose units are shown in the row “Avg.”, which displays the average reference value. “N” is the amount of data included in the statistics. The VE1S statistics exclude any contributions from Si2H6, which geometry optimizes into a hopelessly nonsensical configuration where all 6 hydrogens are clustered between the two silicons, at which point we can no longer coax SCF convergence. Thus, we expect the true VE1S errors to be larger than those reported here