Just to illustrate that we cause much hand-wringing for Cateye's product planners...

The speedometer is my least-used screen, at least on the road bike (my commuter doesn't have a computer). I set it, a Shimano Flight Deck, to show cadence and the time of day (speed is still there, but it uses smaller digits), and my Garmin watch gives HR. I just don't care about speed readings, because if I'm going on a slight downhill or with a tailwind, I'll think that I'm going really fast for the effort; and the opposite if I'm on a slight uphill or into a headwind.