Features of a favorite keyboard, in order:
1. Usability, a board that helps me make less typos.
2. Feeling, its caps and switches has the right force, spring back and texture.
3. Look, high contrast legends, clean design, contrasting modifiers.
4. Layout, the easiest for the task I do frequently.
5. Programmable, that allows me to try layout changes and options.
6. Feedback, its sound is nice, not too loud, deep not high pitch, solid.