Calculations of Fermi surface properties, interband absorption ε2(ω) and photoemission have been performed using the Chodorow potential for copper. Momentum matrix elements have also been calculated. Comparison of these results to experiment indicates that the Chodorow potential, while adequate for most of the occupied states, underestimates the Fermi surface neck areas, and gives excited-state energies which are about 10 % too low. The central point is made that such calculations can now be performed with sufficient interna1 accuracy to bring experimental data to bear on the formulation of the effective one-electron potential