Dave - re: cleanliness of engraved features -
The edit and cursor functions are all "blind-embossed", which means they are molded into the surface of the keytop.
They are at a depth of 0.25 mm, which means they are not deep enough to collect typical debris.
In our experience using it around food venues, we have never seen an issue with collecting material in them.
One could certainly contrive a perfect storm of some pigmented adhesive-like syrup to try to fill them, but it would not be a common circumstance we encounter in daily use. And if it ever happened, it would be easy to clean with a damp cloth.
These are not the cnc mill-engraved legends of the old days, that had deep wells and sharp shear edges that trapped dirt. They are molded into the key, and designed with precision radii to discourage entrapment of material.
The mechanical geometry along with the medium pearl grey color keep these keys looking very clean.