How much did that end up costing?
I paid around $165 total, arrived fast. They got stuck in customs for 2 days, though.
So far, my initial thoughts (are probably similar to what sixty posted)...but noticeably: keycaps are more textured and the modifier keys are slightly harder to depress because they contain different stabilizers than FILCO keyboards. The Archiss key caps provide more of a "feel", rather than the flat FILCO caps that become glossy after using them for a week.
Corners of the keyboards are rounded...initially I did not take note of it, nor cared for it, but it does seem to affect the overall feel of the keyboard. The edges just feel more comfortable to touch when I'm tapping the sides of the keyboard. (Again, this may be a completely psychological thing and won't affect the operation of the keyboard.)
The brown switches themselves feel a little tight and slightly more harder to depress than my FILCO browns. Upon closer inspection, the brown switch itself from the FILCO looks lighter than the one of my Archiss.