Many comprehensive assessments of modern DFT are available, based upon small noncovalent dimer data sets. In Section 2.2.1, we briefly consider the performance of selected methods for the S66 set, in order to establish that sub-kcal/mol accuracy is a reality in contemporary DFT for small vdW complexes. Section 2.2.2 considers the role of basis-set superposition error (BSSE). Except in our discussion of BSSE, where some smaller basis sets are examined for demonstrative purposes, all of the DFT calculations reported here are performed near the CBS limit, in order to ascertain the true performance of DFT for noncovalent interactions. Unless stated otherwise, all DFT calculations reported herein use the def2-QZVPD basis set. (An exception is that for DFT+XDM calculations we use the aug-cc-pVTZ basis set, following literature recommendations. ) All DFT interaction energies include Boys-Bernardi counterpoise (CP) correction. Benchmarks tests establish that quadruple-ζ basis sets are sufficient to obtain the DFT/CBS limit for noncovalent interactions, except for a few especially problematic Minnesota functionals. At the DFT/def2-QZVPD level, CP correction typically modifies E int by ∼ 0.1 kcal/mol, which establishes that the DFT/CBS limit has been reached. The use of DFT/CBS interaction energies prevents basis-set artifacts from clouding the discussion.