Yeah, I was expecting a post like this and I understand what you're saying. However, I'm willing to bet that your eyes wonder from traffic now and then to take a look at the scenery or something else. There's a good chunk of my commute that's on a bike trail. Besides, I'm mostly interested in this for longer rides when I'm not having to worry about traffic very much. Just like my cyclocomputer I'll pay little, if any attention to it while mixing it up in traffic.

What's nice about an iPhone (or any smart phone) is the HUGE backlit screen as compared to a standard cyclocomputer. Instead of fumbling with some tiny buttons to turn a backlight on or switching what's displayed I can see what I want at a glance.

I totally get that some folks don't give a rip what their average time is or whether today was faster than last week, but information like that is a great training aid.