Manschot [Appl. Phys. Lett. 85, 3250 (2004)] predicted that the critical current to switch the magnetizations in a ferromagnetic/nonmagnetic/ferromagnetic nanopillar from parallel to antiparallel could be reduced by up to a factor of 5 by pairing nonmagnetic leads with different effective resistances (resistivity times spin diffusion length). Comparing switching currents for Co/Cu/Co nanopillars with Pt and AgSn(5%) leads on alternate sides of the nanopillar did not give the large reduction predicted by Manschot Possible reasons for this lack are discussed. (c) 2006 American Institute of Physics.