Can cosmos works do frequency response? Kidding. I know it can't. I have been evaluating Ansys 10 workbench for a few weeks. Significant plusses are the ability to do modal superposition or full solve of each node; vastly more flexible meshing controls; full support for remote solution on a linux cluster so you can do a large model on a system with 16 GB main memory; intimate integration to solidworks given the "update all components" command necessary in cosmos works hands the competition the advantage.