I imagine all runners wear some sort of stopwatch, whether it is the $5 WalMart variety, my watch of choice, or a $300 GPS HRM 400-lap contraption. Regardless, we love our watches.
In my case, my watch reflects my values and personality. Simple, inexpensive, functional, and accurate. It has weaknesses, however. The light for night use is nearly useless, and if I am running at a reasonable pace at all I can't see it. I still haven't figured out how to make it record laps. How I set the day of the week is an abject mystery. The beep that goes off at ten minutes to each hour is unstoppable.
But I have run two marathons with this watch. It works fine. I kind of like its weaknesses. We have a history together. We are getting better, and faster.
But there is no denying that even with these platitudes, the watch don't lie. And that can hurt.