fitbitch
I never wanted a GPS watch when they first came out. The first ones were big and seemed to be more trouble than they were worth. I was satisfied with my estimates of how far I ran which later turned out to be grossly exaggerated. My sister got me a fancy Fitbit for my birthday a few years ago. At first I was skeptical but it became a welcome part of my day, documenting my runs, counting my steps, telling me my ass had sat down long enough on the chair and just generally encouraging me to move. I looked forward to the nice little wrist buzz I got when it celebrated my walking or running 10,000 steps. During races I loved that it ticked off the miles for me, making the run seem to go by just a little bit faster. I didn't love it's truthfulness though. I discovered that my 20 miler pre marathon runs were more like 17 or 18 miles. But this goes to show you - running 20 miles pre marathon, or even thinking you ran 20 miles is probably better for you mentally than phy