My two cents about my computer...

Buying it:

1. I wanted it to be small so it could fit nicely on my handlebar stem.
2. I wanted it to be a simple one-button function.
3. I wanted it to be wired.
4. I wanted good quality and durable.
5. I wanted it to look good.
6. At the very least, I wanted Speed, ODO, Distance, and Clock/Time.
7. I wanted to be able to mount and unmount easily so I can take it with me after each ride.

I bought a Cateye Strada Cadence.

I will say though, I do like having all the features and they're very easy to click to but I find I normally keep my setting on MPH with Cadence. The MPH isn't so much a big deal but the cadence helps me to be efficient as I'm cycling. I find that I too often pedal on a higher gear at a low cadence which in turn makes my legs work more and wears out my knees without me realizing it. The cadence feature also helps me to double check my pedal strokes to make sure I'm maintaining an average of 90 rpm.