hkimsey,

I assume Felder makes most fine. If memory serves, I have seen less than a dozen complaints here of cupped jointer fences across the width over close to 20 yrs.

I know the slider on the saw is much more substantial extrusion but Felder makes them in 12’ lengths per flat. It is the flattest surface in my shop. I assume that experience likely transfers to jointer fence extrusion as well.

Imran