These results prove to be a best-case scenario for DFT. We next examine larger systems, ranging up to nanoscale vdW complexes (Section 4.1), comparing DFT to what benchmarks are available. As for the smaller systems, we use CP-corrected DFT/def2-QZVPD interaction energies where feasible, in order to reveal the inherent performance of each functional, except that for the largest complexes we will use CP-corrected DFT/def2-TZVPD calculations. (These should still lie close to the DFT/CBS limit. ) Following that this comparison of DFT interaction energies to reference values, we will examine the magnitude of the dispersion corrections for these systems (Section 4.2) and the size of the CP corrections (Section 4.3). This discussion will paint a rather different picture as compared to what we have seen in small dimers.