The BH&H-LYP functional can be used to obtain convergent n-body expansions and it is interesting that the same functional often works well in problematic cases of ground-or excited-state charge transfer, whereas functionals such as B3LYP and PBE0 (the latter with α hfx = 0.25) often substantially underestimate charge-transfer energies. In the early days of molecular DFT, the BH&H-LYP functional was assessed as unfit for general-purpose calculations, at least in comparison to B3LYP. Indeed, errors for atomization energies 109,125 and for reaction energies 126 are somewhat larger as compared to B3LYP, yet BH&H-LYP is superior to B3LYP for barrier heights. In Table , we compare BH&H-LYP side-by-side with B3LYP (including an empirical dispersion correction for both functionals), 128 using the GMTKN55 data set. The overall performance of BH&H-LYP is only marginally worse than that of B3LYP, so the former may be a sensible alternative in cases where standard functionals exhibit SIE problems, including applications of MBE(n).