Having established the accuracy of dispersion-inclusive DFT for noncovalent interactions, at least in small systems, we next use small-dimer data sets to examine the nature of the dispersion corrections themselves. A question then arises as to what should constitute a benchmark dispersion energy, since DFT add-ons such as D3, D4, XDM, and MBD are defined as asymptotic corrections for longrange correlation, whereas middle-range correlation effects are contained within the XC functional. We will use the SAPT formalism to provide dispersion benchmarks, as described in Section 3.1, to which we compare the aforementioned ad hoc corrections in Section 3.2. Finally, in Section 3.3, we document the remarkable consistency of these ad hoc corrections, for small dimers. All calculations in the present work are confined to the ground state. We do note recent benchmarks on noncovalent excimers, which suggest that the ad hoc D3 and D4 dispersion corrections are less consistent for excited-state calculations using TDDFT, considering relatively small systems ranging from benzene dimer to the naphthalene and pyrene dimers. For excited states, specialized dispersion models may be required, and this represents an avenue for future development. Excited-state SAPT methods, which might provide benchmark data, are only beginning to be developed.