I'm trying to create a reflective concave surface and I'm getting artifacts and the polygon edges of the surface are visible.  Click on the image for a larger size to see the lines in the wall just above the disk as well as the odd artifacts.

I'm using BB's Glossy material for the reflective surface, and his Environment sphere to give it something to reflect.

I'll post the render settings, material settings, and model wireframe next.

Thanks in advance.

 -s