When using the SpaceTraveler, do I miss the extra buttonality of the SpacePilot, and its dorkulous indiglow, backlit LCD display? Honestly, not really. I never really touch most of the buttons on the SpacePilot. The only ones that I've used regularly are the "Fit," "T," "L," "R," "F," "Dom," and "3D-Lock" buttons. The duplicated keyboard functions are a slick idea, but in practice, it's tricky to learn their non-standard layout. And one can program the SpaceTraveler's buttons anyway, even if they're a bit difficult to differentiate during real-world use.